It appears, at least on my computer, to be installed under my User Profile.
To check if ANY user on the computer has it installed …
Exists Keys whose (exists key "Software\Microsoft\Windows\CurrentVersion\Uninstall\Teams" of it) of key "HKEY_USERS" of Registry
I’m currently having trouble with the Fixlet Debugger so I can’t give you the “Current User” version of the relevance. I’ll get it up here as soon as I can.