I'm not exactly sure what the issue is .. I'm also unable to find the modpack, though I was told my name was added to the list of people who are allwoed to use it (SilverKytten) I had to get the 1.7.10 version from Felinoel, but wanted to use the 1.6.4 version so I could join the server.
Spoiler
[25/12/2014 15:58:42 PM] Loading Language: English
[25/12/2014 15:58:42 PM] Loading Language: English
[25/12/2014 15:58:42 PM] ATLauncher Version: 3.2.2.1
[25/12/2014 15:58:42 PM] Operating System: Windows 7
[25/12/2014 15:58:42 PM] RAM Available: 16278MB
[25/12/2014 15:58:42 PM] Java Version: Launcher: 1.7.0_60, Minecraft: 1.7.0_60
[25/12/2014 15:58:42 PM] Java Path: C:\Program Files\Java\jre7
[25/12/2014 15:58:42 PM] 64 Bit Java: true
[25/12/2014 15:58:42 PM] Launcher Directory: **USERSDIR**
[25/12/2014 15:58:42 PM] Using Theme: ATLauncher by RyanTheAllmighty
[25/12/2014 15:58:42 PM] Showing splash screen and loading everything
[25/12/2014 15:58:42 PM] Checking for updated files!
[25/12/2014 15:58:43 PM] Updates found!
[25/12/2014 15:58:43 PM] Downloading Launcher File packs.json
[25/12/2014 15:58:44 PM] Finished downloading updated files!
[25/12/2014 15:58:44 PM] Loading Language: English
[25/12/2014 15:58:44 PM] [Background] Checking Minecraft Versions Started
[25/12/2014 15:58:45 PM] Checking account UUID's!
[25/12/2014 15:58:45 PM] Launcher finished loading everything
[25/12/2014 15:58:45 PM] Launcher opening
[25/12/2014 15:58:45 PM] Made By Bob*
[25/12/2014 15:58:45 PM] *(Not Actually)
[25/12/2014 15:58:45 PM] Setting up Bottom Bar
[25/12/2014 15:58:45 PM] Finished Setting up Bottom Bar
[25/12/2014 15:58:45 PM] Setting up Tabs
[25/12/2014 15:58:46 PM] Finished Setting up Tabs
[25/12/2014 15:58:46 PM] Showing Launcher
[25/12/2014 15:58:47 PM] [Background] Checking Minecraft Versions Complete
[25/12/2014 15:58:54 PM] Started install of Absolute Zero - 1.4.1 (Minecraft 1.6.4)
[25/12/2014 16:11:33 PM] Server Auto Not Available! Switching To EU - Amsterdam 1
[25/12/2014 16:11:33 PM] Error downloading obsidiplates-1.6.2-universal-2.0.0.15.jar from http://download.node...l-2.0.0.15.jar. Expected hash of c64ea8742cd60ef359d36bb84d4b10a5 but got 54a1cdd9cdb36c6b4db404d68e4d0772 instead. Trying another server!
[25/12/2014 16:11:34 PM] Server EU - Amsterdam 1 Not Available! Switching To EU - Amsterdam 2
[25/12/2014 16:11:34 PM] Error downloading obsidiplates-1.6.2-universal-2.0.0.15.jar from http://bob.nodeserve...l-2.0.0.15.jar. Expected hash of c64ea8742cd60ef359d36bb84d4b10a5 but got 54a1cdd9cdb36c6b4db404d68e4d0772 instead. Trying another server!
[25/12/2014 16:11:36 PM] Server EU - Amsterdam 2 Not Available! Switching To EU - Amsterdam 3
[25/12/2014 16:11:36 PM] Error downloading obsidiplates-1.6.2-universal-2.0.0.15.jar from http://emma.nodeserv...l-2.0.0.15.jar. Expected hash of c64ea8742cd60ef359d36bb84d4b10a5 but got 54a1cdd9cdb36c6b4db404d68e4d0772 instead. Trying another server!
[25/12/2014 16:11:38 PM] Server EU - Amsterdam 3 Not Available! Switching To US East - Ashburn 1
[25/12/2014 16:11:38 PM] Error downloading obsidiplates-1.6.2-universal-2.0.0.15.jar from http://lisa.nodeserv...l-2.0.0.15.jar. Expected hash of c64ea8742cd60ef359d36bb84d4b10a5 but got 54a1cdd9cdb36c6b4db404d68e4d0772 instead. Trying another server!
[25/12/2014 16:11:39 PM] Server US East - Ashburn 1 Not Available! Switching To US East - Ashburn 2
[25/12/2014 16:11:39 PM] Error downloading obsidiplates-1.6.2-universal-2.0.0.15.jar from http://anne.nodeserv...l-2.0.0.15.jar. Expected hash of c64ea8742cd60ef359d36bb84d4b10a5 but got 54a1cdd9cdb36c6b4db404d68e4d0772 instead. Trying another server!
[25/12/2014 16:11:40 PM] Server US East - Ashburn 2 Not Available! Switching To US East - Ashburn 3
[25/12/2014 16:11:40 PM] Error downloading obsidiplates-1.6.2-universal-2.0.0.15.jar from http://bruce.nodeser...l-2.0.0.15.jar. Expected hash of c64ea8742cd60ef359d36bb84d4b10a5 but got 54a1cdd9cdb36c6b4db404d68e4d0772 instead. Trying another server!
[25/12/2014 16:11:41 PM] Server US East - Ashburn 3 Not Available! Switching To US West - Phoenix 1
[25/12/2014 16:11:41 PM] Error downloading obsidiplates-1.6.2-universal-2.0.0.15.jar from http://dave.nodeserv...l-2.0.0.15.jar. Expected hash of c64ea8742cd60ef359d36bb84d4b10a5 but got 54a1cdd9cdb36c6b4db404d68e4d0772 instead. Trying another server!
[25/12/2014 16:11:42 PM] Server US West - Phoenix 1 Not Available! Switching To US West - Phoenix 2
[25/12/2014 16:11:42 PM] Error downloading obsidiplates-1.6.2-universal-2.0.0.15.jar from http://adam.nodeserv...l-2.0.0.15.jar. Expected hash of c64ea8742cd60ef359d36bb84d4b10a5 but got 54a1cdd9cdb36c6b4db404d68e4d0772 instead. Trying another server!
[25/12/2014 16:11:43 PM] Server US West - Phoenix 2 Not Available! Switching To US West - Phoenix 3
[25/12/2014 16:11:43 PM] Error downloading obsidiplates-1.6.2-universal-2.0.0.15.jar from http://bill.nodeserv...l-2.0.0.15.jar. Expected hash of c64ea8742cd60ef359d36bb84d4b10a5 but got 54a1cdd9cdb36c6b4db404d68e4d0772 instead. Trying another server!
[25/12/2014 16:11:44 PM] http://chuck.nodeser...al-2.0.0.15.jar returned response code 404 with message of Not Found
[25/12/2014 16:11:44 PM] com.atlauncher.data.Downloadable.getConnection(Downloadable.java:217)
[25/12/2014 16:11:44 PM] com.atlauncher.data.Downloadable.isGziped(Downloadable.java:182)
[25/12/2014 16:11:44 PM] com.atlauncher.data.Downloadable.downloadFile(Downloadable.java:252)
[25/12/2014 16:11:44 PM] com.atlauncher.data.Downloadable.download(Downloadable.java:387)
[25/12/2014 16:11:44 PM] com.atlauncher.data.Downloadable.download(Downloadable.java:328)
[25/12/2014 16:11:44 PM] com.atlauncher.data.Downloadable.download(Downloadable.java:396)
[25/12/2014 16:11:44 PM] com.atlauncher.data.Downloadable.download(Downloadable.java:328)
[25/12/2014 16:11:44 PM] com.atlauncher.data.Downloadable.download(Downloadable.java:396)
[25/12/2014 16:11:44 PM] com.atlauncher.data.Downloadable.download(Downloadable.java:328)
[25/12/2014 16:11:44 PM] com.atlauncher.data.Downloadable.download(Downloadable.java:396)
[25/12/2014 16:11:44 PM] com.atlauncher.data.Downloadable.download(Downloadable.java:328)
[25/12/2014 16:11:44 PM] com.atlauncher.data.Downloadable.download(Downloadable.java:396)
[25/12/2014 16:11:44 PM] com.atlauncher.data.Downloadable.download(Downloadable.java:328)
[25/12/2014 16:11:44 PM] com.atlauncher.data.Downloadable.download(Downloadable.java:396)
[25/12/2014 16:11:44 PM] com.atlauncher.data.Downloadable.download(Downloadable.java:328)
[25/12/2014 16:11:44 PM] com.atlauncher.data.Downloadable.download(Downloadable.java:396)
[25/12/2014 16:11:44 PM] com.atlauncher.data.Downloadable.download(Downloadable.java:328)
[25/12/2014 16:11:44 PM] com.atlauncher.data.Downloadable.download(Downloadable.java:396)
[25/12/2014 16:11:44 PM] com.atlauncher.data.Downloadable.download(Downloadable.java:328)
[25/12/2014 16:11:44 PM] com.atlauncher.data.Downloadable.download(Downloadable.java:396)
[25/12/2014 16:11:44 PM] com.atlauncher.data.Downloadable.download(Downloadable.java:328)
[25/12/2014 16:11:44 PM] com.atlauncher.data.Downloadable.download(Downloadable.java:396)
[25/12/2014 16:11:44 PM] com.atlauncher.data.Downloadable.download(Downloadable.java:328)
[25/12/2014 16:11:44 PM] com.atlauncher.workers.InstanceInstaller$5.run(InstanceInstaller.java:1047)
[25/12/2014 16:11:44 PM] java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
[25/12/2014 16:11:44 PM] java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
[25/12/2014 16:11:44 PM] java.lang.Thread.run(Unknown Source)
[25/12/2014 16:11:44 PM] Failed to download packs/AbsoluteZero/files/mods/obsidiplates-1.6.2-universal-2.0.0.15.jar from all ATLauncher servers. Cancelling install!
[25/12/2014 15:58:42 PM] Loading Language: English
[25/12/2014 15:58:42 PM] ATLauncher Version: 3.2.2.1
[25/12/2014 15:58:42 PM] Operating System: Windows 7
[25/12/2014 15:58:42 PM] RAM Available: 16278MB
[25/12/2014 15:58:42 PM] Java Version: Launcher: 1.7.0_60, Minecraft: 1.7.0_60
[25/12/2014 15:58:42 PM] Java Path: C:\Program Files\Java\jre7
[25/12/2014 15:58:42 PM] 64 Bit Java: true
[25/12/2014 15:58:42 PM] Launcher Directory: **USERSDIR**
[25/12/2014 15:58:42 PM] Using Theme: ATLauncher by RyanTheAllmighty
[25/12/2014 15:58:42 PM] Showing splash screen and loading everything
[25/12/2014 15:58:42 PM] Checking for updated files!
[25/12/2014 15:58:43 PM] Updates found!
[25/12/2014 15:58:43 PM] Downloading Launcher File packs.json
[25/12/2014 15:58:44 PM] Finished downloading updated files!
[25/12/2014 15:58:44 PM] Loading Language: English
[25/12/2014 15:58:44 PM] [Background] Checking Minecraft Versions Started
[25/12/2014 15:58:45 PM] Checking account UUID's!
[25/12/2014 15:58:45 PM] Launcher finished loading everything
[25/12/2014 15:58:45 PM] Launcher opening
[25/12/2014 15:58:45 PM] Made By Bob*
[25/12/2014 15:58:45 PM] *(Not Actually)
[25/12/2014 15:58:45 PM] Setting up Bottom Bar
[25/12/2014 15:58:45 PM] Finished Setting up Bottom Bar
[25/12/2014 15:58:45 PM] Setting up Tabs
[25/12/2014 15:58:46 PM] Finished Setting up Tabs
[25/12/2014 15:58:46 PM] Showing Launcher
[25/12/2014 15:58:47 PM] [Background] Checking Minecraft Versions Complete
[25/12/2014 15:58:54 PM] Started install of Absolute Zero - 1.4.1 (Minecraft 1.6.4)
[25/12/2014 16:11:33 PM] Server Auto Not Available! Switching To EU - Amsterdam 1
[25/12/2014 16:11:33 PM] Error downloading obsidiplates-1.6.2-universal-2.0.0.15.jar from http://download.node...l-2.0.0.15.jar. Expected hash of c64ea8742cd60ef359d36bb84d4b10a5 but got 54a1cdd9cdb36c6b4db404d68e4d0772 instead. Trying another server!
[25/12/2014 16:11:34 PM] Server EU - Amsterdam 1 Not Available! Switching To EU - Amsterdam 2
[25/12/2014 16:11:34 PM] Error downloading obsidiplates-1.6.2-universal-2.0.0.15.jar from http://bob.nodeserve...l-2.0.0.15.jar. Expected hash of c64ea8742cd60ef359d36bb84d4b10a5 but got 54a1cdd9cdb36c6b4db404d68e4d0772 instead. Trying another server!
[25/12/2014 16:11:36 PM] Server EU - Amsterdam 2 Not Available! Switching To EU - Amsterdam 3
[25/12/2014 16:11:36 PM] Error downloading obsidiplates-1.6.2-universal-2.0.0.15.jar from http://emma.nodeserv...l-2.0.0.15.jar. Expected hash of c64ea8742cd60ef359d36bb84d4b10a5 but got 54a1cdd9cdb36c6b4db404d68e4d0772 instead. Trying another server!
[25/12/2014 16:11:38 PM] Server EU - Amsterdam 3 Not Available! Switching To US East - Ashburn 1
[25/12/2014 16:11:38 PM] Error downloading obsidiplates-1.6.2-universal-2.0.0.15.jar from http://lisa.nodeserv...l-2.0.0.15.jar. Expected hash of c64ea8742cd60ef359d36bb84d4b10a5 but got 54a1cdd9cdb36c6b4db404d68e4d0772 instead. Trying another server!
[25/12/2014 16:11:39 PM] Server US East - Ashburn 1 Not Available! Switching To US East - Ashburn 2
[25/12/2014 16:11:39 PM] Error downloading obsidiplates-1.6.2-universal-2.0.0.15.jar from http://anne.nodeserv...l-2.0.0.15.jar. Expected hash of c64ea8742cd60ef359d36bb84d4b10a5 but got 54a1cdd9cdb36c6b4db404d68e4d0772 instead. Trying another server!
[25/12/2014 16:11:40 PM] Server US East - Ashburn 2 Not Available! Switching To US East - Ashburn 3
[25/12/2014 16:11:40 PM] Error downloading obsidiplates-1.6.2-universal-2.0.0.15.jar from http://bruce.nodeser...l-2.0.0.15.jar. Expected hash of c64ea8742cd60ef359d36bb84d4b10a5 but got 54a1cdd9cdb36c6b4db404d68e4d0772 instead. Trying another server!
[25/12/2014 16:11:41 PM] Server US East - Ashburn 3 Not Available! Switching To US West - Phoenix 1
[25/12/2014 16:11:41 PM] Error downloading obsidiplates-1.6.2-universal-2.0.0.15.jar from http://dave.nodeserv...l-2.0.0.15.jar. Expected hash of c64ea8742cd60ef359d36bb84d4b10a5 but got 54a1cdd9cdb36c6b4db404d68e4d0772 instead. Trying another server!
[25/12/2014 16:11:42 PM] Server US West - Phoenix 1 Not Available! Switching To US West - Phoenix 2
[25/12/2014 16:11:42 PM] Error downloading obsidiplates-1.6.2-universal-2.0.0.15.jar from http://adam.nodeserv...l-2.0.0.15.jar. Expected hash of c64ea8742cd60ef359d36bb84d4b10a5 but got 54a1cdd9cdb36c6b4db404d68e4d0772 instead. Trying another server!
[25/12/2014 16:11:43 PM] Server US West - Phoenix 2 Not Available! Switching To US West - Phoenix 3
[25/12/2014 16:11:43 PM] Error downloading obsidiplates-1.6.2-universal-2.0.0.15.jar from http://bill.nodeserv...l-2.0.0.15.jar. Expected hash of c64ea8742cd60ef359d36bb84d4b10a5 but got 54a1cdd9cdb36c6b4db404d68e4d0772 instead. Trying another server!
[25/12/2014 16:11:44 PM] http://chuck.nodeser...al-2.0.0.15.jar returned response code 404 with message of Not Found
[25/12/2014 16:11:44 PM] com.atlauncher.data.Downloadable.getConnection(Downloadable.java:217)
[25/12/2014 16:11:44 PM] com.atlauncher.data.Downloadable.isGziped(Downloadable.java:182)
[25/12/2014 16:11:44 PM] com.atlauncher.data.Downloadable.downloadFile(Downloadable.java:252)
[25/12/2014 16:11:44 PM] com.atlauncher.data.Downloadable.download(Downloadable.java:387)
[25/12/2014 16:11:44 PM] com.atlauncher.data.Downloadable.download(Downloadable.java:328)
[25/12/2014 16:11:44 PM] com.atlauncher.data.Downloadable.download(Downloadable.java:396)
[25/12/2014 16:11:44 PM] com.atlauncher.data.Downloadable.download(Downloadable.java:328)
[25/12/2014 16:11:44 PM] com.atlauncher.data.Downloadable.download(Downloadable.java:396)
[25/12/2014 16:11:44 PM] com.atlauncher.data.Downloadable.download(Downloadable.java:328)
[25/12/2014 16:11:44 PM] com.atlauncher.data.Downloadable.download(Downloadable.java:396)
[25/12/2014 16:11:44 PM] com.atlauncher.data.Downloadable.download(Downloadable.java:328)
[25/12/2014 16:11:44 PM] com.atlauncher.data.Downloadable.download(Downloadable.java:396)
[25/12/2014 16:11:44 PM] com.atlauncher.data.Downloadable.download(Downloadable.java:328)
[25/12/2014 16:11:44 PM] com.atlauncher.data.Downloadable.download(Downloadable.java:396)
[25/12/2014 16:11:44 PM] com.atlauncher.data.Downloadable.download(Downloadable.java:328)
[25/12/2014 16:11:44 PM] com.atlauncher.data.Downloadable.download(Downloadable.java:396)
[25/12/2014 16:11:44 PM] com.atlauncher.data.Downloadable.download(Downloadable.java:328)
[25/12/2014 16:11:44 PM] com.atlauncher.data.Downloadable.download(Downloadable.java:396)
[25/12/2014 16:11:44 PM] com.atlauncher.data.Downloadable.download(Downloadable.java:328)
[25/12/2014 16:11:44 PM] com.atlauncher.data.Downloadable.download(Downloadable.java:396)
[25/12/2014 16:11:44 PM] com.atlauncher.data.Downloadable.download(Downloadable.java:328)
[25/12/2014 16:11:44 PM] com.atlauncher.data.Downloadable.download(Downloadable.java:396)
[25/12/2014 16:11:44 PM] com.atlauncher.data.Downloadable.download(Downloadable.java:328)
[25/12/2014 16:11:44 PM] com.atlauncher.workers.InstanceInstaller$5.run(InstanceInstaller.java:1047)
[25/12/2014 16:11:44 PM] java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
[25/12/2014 16:11:44 PM] java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
[25/12/2014 16:11:44 PM] java.lang.Thread.run(Unknown Source)
[25/12/2014 16:11:44 PM] Failed to download packs/AbsoluteZero/files/mods/obsidiplates-1.6.2-universal-2.0.0.15.jar from all ATLauncher servers. Cancelling install!