I haven't played minecraft in nearly 1 year. I went to download FTB Sky Factory 3 in the Twitch desktop app and I downloaded it perfectly fine. When I pressed play it loaded and it said "game crash, an unexpected issue occurred and the game has crashed. We're sorry for the inconvenience". I have tried everything I can thing of reinstalling minecraft and java, looking at forums (still didn't work), and uninstall/update drivers.
I don't know much, so that's probably why I can't fix it.
Download and install the offline 64 bit. You can also install the 32 bit version if you like, to keep everything on the system in sync, but Minecraft will use the 64 bit version only.
Then, in the Twitch launcher window, click the three line icon in the upper left of the window. Select File, then Settings, the click on Minecraft, under launch method, select Jar Launcher, not Native Launcher, and under Java version, select "Always use latest version". You can also scroll down to adjust memory usage and stuff like that.
See if that helps.
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