well, it takes a long time to download because its a pretty big modpack and does it crash when you launch it or when it finished downloading?
Well when I first downloaded it, it was crashing when I was launching it. fixed it by going into the options tab and increasing the max RAM. You might have to download Java 64 bit.
I use a mac for the FTB server.It worked fine for me,all I need to do is update the Java and be patient.
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