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If it uses 30-40 minutes that's not normal. My first thought was there is not enough RAM allocated for MC or machine starts swapping but without log there won't be real answers.

Do you remember when you have used FTB launcher first time in that intallation: 2014 or late 2013? How many FTBOSSentx.x.x.txt files there is in %appdata%\ftblauncher\ and which is the oldest?

"Caused by: java.lang.OutOfMemoryError: GC overhead limit exceeded" Increase your memory allocation.

Well could it be possible that something cleaned temporary internet files and pack instances are gone now? I'm sure unleashed has not got updates for a long time and pack was just re-installed, not updated. According to the log you chose to ignore warning about bad installation location:/ Ps...

Or use thirdparty tool: https://github.com/idynin/FTBUtils

"Error: Could not find or load main class net.ftb.legacylaunch.Launch" I don't know what to say except: On the launcher go to options then click the force update button, then launch the modpack. That might fix the thing if earlier download failed.

Nice work. I recently found that solution also. Now I know it really might help => it goes in my knowledge base.

New clean server installation works for me. Can you upload list of mods? (protip: command line and: dir /s /on mods > modlist.txt then pastebin contents of modlist.txt)

In the launcher's options tab, check the boxes "Show Console" and "Reopen launcher when Minecraft exits". Then launch your pack again and when the crash/error/other problem occurs, click the "upload log" button in console window and give us the link.

It is still caused by firewall which blocks HEAD request and makes launcher to download wrong file.

Did you edit the pack?

On the launcher go to options then click the force update button, then launch the modpack.

Install http://new.creeperrepo.net/FTB2/maven/net/minecraftforge/lex/legacyjavafixer/1.0/legacyjavafixer-1.0.jar in mods folder

Reintall java and/or http://stackoverflow.com/a/30577609/776884

I don't have solution for your problem but I have a tip for you: Please, do not do "I have the same problem" replies. Trust me, your problem is not same as OP's problem even both have same symptom: game crashes. Just open new thread your problem(remember to fill template) and then wait until...

On the launcher go to options then click the force update button, then launch the modpack.

Check you firewall/AV products. Something blocks HTTP HEAD requests.

Did you try starting FTB_Launcher.jar from command line with "java -jar FTB_Launcher.jar" ?

That should be done asap. I have skipped spam reporting because waiting is annoying.

On the launcher go to options then click the force update button, then launch the modpack.