I installed RedGuides Launcher, went to login, added MySeq, clicked to install Very Vanilla and the launcher disappeared.
I did as instructed.
If the launcher had worked before but is now crashing on startup, open file explorer and go to %LocalAppData%\RedGuides and delete the contents, and then %LocalAppData%\RGResourceManager and delete the contents.
And then relaunched. It stayed up so I clicked login, it said close webpage so I did and noticed RedGuides launcher crashed again.
I repeated the clearing process a few times to ensure it wasnt just a weird thing where something gets messed up 3 times and then goes right 4th and yet it crashed after logging in every time.