This is not a problem of the new launcher, but a problem that those vanilla mods that previously worked in WOTC have not been updated to WOTC format, and may never be updated. However, unlike the old launcher, the new launcher, when you play WOTC will only load WOTC mods and no longer load vanilla mods (that worked in WOTC). The patched updated launcher now works just fine for loading mods for the vanilla game XCOM2 or the expansion WOTC. Because of player feedback, on June 30, 2020, Firaxis directed 2K Games to push out another update to fix this problem. This update broke the XCOM2/WOTC launcher and mods would no longer install properly. Background: Around June 1, 2020, 2K Games pushed an update to the XCOM2/WOTC Launcher to promote a new game 'Chimera'.