Cannot launch FTB to download it

  • Tech Support section is for getting help with FTB related problems. If there's a repeatable issue that can be labeled as a bug, then please use the issue tracker for the pack or the app at GitHub issue trackers - If there's no repository for a pack that means that the pack is old and/or will not be updated. Eventual bugs for older packs will not be fixed.


New Member
May 22, 2020
I have run in to a problem when trying to instal FTB launcher that when I launch it from downloads folder it gives me an error:

"The JVM could not be started. The maximum heap size (-Xmx) might be too large or an antivirus or firewall tool could block the execution."

I have tried with installing Java. Both 32bit and 64bit together and seperately. But none of them gave different result.


New Member
May 24, 2020
Have you tried temporarily disabling your Antivirus and/or firewall to see if this is the issue?