If you're not using oldprerelease channel in your config.xml that guide won't work, as it was written previously to 1.1 version.
You can change this channel and work with 0.3.7 or just adapt your resources to 1.1, which means removing the bridge plugin and using dotnet folder instead of bridge one.
Did you try to verify files integrity? Can you run GTA Online?
About the last sentence, I guess that it's obvious that you want to play as you're asking for support, but thanks for clarifying!
Pues siendo la versión de Epic tan nueva, la verdad que ahí no sé que puede pasar, igual es mejor preguntar en el discord que suele responder más gente.
The password you're trying to enter is not correct, just recover your Social Club password. Seems to be related to Rockstar's Social Club, as you're failing to insert the password on their launcher's login, nothing related to RAGE at all.