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My FTB used to work just fine but i decided to switch from mindcrack to unleashed, it would download but when it would start downloading the .jar files it wouldn't and now i cant play any of the modpacks please help
Please provide a console log in debug mode to pastebin.com and link to it here. Preferably as you are trying to run/download a pack. Look here for more info about getting the logs.
That is a little strange that it stops there after download the pack. I would try a reinstall using the recommended way. This usually solves a lot of the problems. It might also be that the servers for Mojang could be experiencing some problems.