If you updated to 0.2.0-RC2 the autoupdate system is not going to work due to a issue with SharpCompress 0.34.1
The RC2 was removed from the releases due to the crashing problems it had.
RC3 Changes:
-Do not load un-enabled packages for dev mode mods
-fix crashing on code-side window closing (introduced in RC2)
-Fix crashing when deleting a modpkg, open pkg folder and fix pkg creation (introduced in RC2)
-Reverted SharpCompress dependency update, now back on 0.33.0
RC2 Changes:
-Fixed the issue that caused some custom cmdline arguments to be ignored.
-Also added a mod setting option to ignore global and system cmdline
-Update Input Settings Section (disabled some unused settings)
-Support .tar.gz and 7z files for auto-update system
-Add Performance Helper Popup
-add open screenshot folder button
-Pack the launcher into a single file (working in linux and windows)
-Delete empty toolstips in fso build list, also hide details button on official FSO builds
-add icons and tune up PXO side text
-Add warning for metadata only upload and remove tile and description warning for builds
-Refactor the way the repo is parsed and the initial load of nebula mods is done
-ModCard and FSO Item templates partial refactor/rework
-Switch to use Compiled Bindings
-Limit the number of displayed fso nightlies
-Updated avalonia version to 11.0.5
-Add warning on modsettings windows about missing saved custom fso build