(It sounds like you already did try updating your installer and trying other older installers.)
It might be worth finding the app settings folder, making a backup of that folder, and then trying to rename or delete it. I wonder if it’s some cache problem or something.
%APPDATA%\obsidian
Save a backup first to be safe, because deleting that folder might mean you’ll lose some things like File Recovery snapshots. (It also might not help your issue, I’m just guessing.)
What version of Windows?