I am an administrator on my computer.
If I have a different password for that, I forgot.
I have tried all passwords I normally use and none works.
What do I do now?
Seems like a purposeful bock to users to update! If the older version required a password why is that nor sufficient now? No other software acts lik this!!!!!!!!!!!!!!!!!!!!!!!!!!!
This isn't a TeamViewer issue. Re-install your operating system if you don't have the skills to hack your admin priveleges back and this time remember your administrator password; I imagine afterwards your TeamViewer issue will resolve itself.