Sorry to be bombarding the forums as of late, I just seem to be hitting issues left and right! Anyways, Every time I click the update button in the corner, the toolkit closes, and there's a new executable in the root directory called "RocksmithToolkitUpdating.exe", and it doesn't seem to go away. I've tried redownloading the toolkit zip folder, running the toolkit as an administrator, as well temporarily disabling my AV, but still nothing. Anyone familiar with this issue?

Looks like it is working now.  Thank you!

Many thanks to @@iminashi for help diagnosing the updater bug.