Zoom 6 uninstalls and installs to version 5.15.5

[drchemo]

I'm having an issue with the unauthorized down-grading of software occurring on our computers. In particular it seems that a recent change in the Zoom software has caused an incompatibility with all current Zoom meetings using software versions below 5.16. Unfortunately, we previously had version 5.15 which would not allow us to join these previously attended/scheduled meetings. The current software version is 6.1, which allowed us to re-login and attend the meetings, but then it was mysteriously just defaulted back to version 5.15 after an apparent forced downgrade.  We are on Windows 10, it seems folks in our group who has Windows 11 does not have this issue?