uninstall newer version of calypso and reinstall old version

[[Ro...]]

We just upgraded to 2021 calypso and are having all kinds of trouble with it. Did anybody ever uninstall the newer version and go back to the old one. If so, whats all involved. Thanks in advance

[[No...]]

If you uninstall a Calypso version, it doesn't delete its old config folders, so a new version can access the data. In case you didn't delete the old folders yourself and changed a lot of settings in the new version, the older one will now reuse the old config. This might be a source of problems.

[[Ni...]]

I just installed the newer versions without uninstalling the old ones.
I am able to open up 2021 and use it. Close it and then open up 2020 and use it.
Close that and open up 2019 and still be able to use it.