@jasonbear can you go to “Updates” from the Dashboard (top left menu), select the update, and click on the update button? The page will reload and it should perform the update successfully.
The “View version 1.2.0.4 details” link is broken. I never update anything before reviewing the changes/changelog.
@jasonbear access this page in Chrome and you will be able to view it: view-source:https://www.gabelivan.com/items/wp-asset-cleanup-pro/changelog – it should have worked. Have you activated the license on only one website? Can you check if it works on other websites you might have activated the license for? Or perhaps on your staging site.