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I'm running a private FTB pack with I think 120 mods, it's set to use 4gb of ram, but the host has 20gb. We have 5 or 6 people on it running very comfortably. I think you'll be fine with 2gb of RAM.
I am having the same problem. Im trying to launch my own private pack and it says the same thing. It seems that the bcprov-jdk15on-148.jar file that it is trying to download from minecraftforge's servers has been deleted.
Caused by: java.io.FileNotFoundException...