Set admin rights to e&b.exe, but haven't checked the router yet. Not exactly sure how I'd go about checking the ports for that at the moment.
It's installed in the Program Files (x86) folder. I deleted the mentioned files, reset the version and updated, finally, to v2.2.0. However, I still get the same error as before; "Server Failed to respond to Login attempt".
In case it matters, this is the launcher I have now: