Maybe your antivirus or firewall blocks the update. Excluding the vorpX program folder (usually C:\Program Files (x86)\Animation Labs\vorpX) from your AV program may help.
if not, reinstalling like steph12 suggests will help. You don’t have to uninstall first. If you need a new installer, you can get one here: https://www.vorpx.com/request-new-download/