Title LAUNCH FAILED - The version you are trying to play inherits properties from an unknown version. Launcher Type Twitch Desktop App Modpack FTB Revelation Modpack version 1.8.0 Have you modified the pack? No Link to log file Details of the issue Simply put, I downloaded minecraft, then downloaded the FTB Revelation mod on twitch app. When I go to click play and click launch this is what it says. I have tried fully reinstalling everything by deleting everything minecraft, twitch, curse, and java related on my pc. I literally typed in each of those 4 words into "my pc" and deleted every single thing that came up with it, including uninstalling them the main ways from control panel. Completely wiped from my pc as best I can and reinstalled again. Reinstalled everything, even followed several guides to make sure I was doing everything correctly. Still the same error. I'm at a loss, I'm not even the least tech savvy person ever, I just don't get what's going on at all anymore.