Best method of uninstalling/reinstalling fresh 4.8.1 Editor

So i have this lighting issue with dominant lights in 4.8.1 and have seems to have gotten zero help or comments, so im of to resort to more forceful methods of fixing the issue.

Whats the best way to back up files for a project AND editor settings and insert them back into a fresh installation.
Are there any files i need to keep in mind while backing up to restore my settings?

Nevermind, i have just seen a method that suits my needs.