How to remove 'Navigate quickly and easily with Teamviewer' splash screen?

Hi there,

Running TV13 on a server 2016 RDP session host. Every time a new user logs in or the server gets rebooted, all users are treated to an annoying splash screen:

Searched and can't find anything. Have tried setting HCKU -> Software -> Teamviewer -> Introshown to 0, but it doesn't work, and it sets itself back to 1 when the server is rebooted (?!).

How on earth do I disable this moronic always-on-top splash screen so that I or anybody else don't ever, ever, ever have to see it again? Thanks,

Jane