I have an older version of ArcGIS Pro installed, because that's what (some of) our customers are using. I also installed the Visual Studio extensions for ArcGIS Pro for this version.
When starting Visual Studio, it automatically updates the Pro extensions for VS to the most recent version. If I then start a new project in Visual Studio, I get an error message about mismatched versions.
The only way to disable the automatic update is to
Uninstall the latest version
Install the version I want, again
Disconnect laptop from internet
Start Visual Studio
Uncheck Automatic updates for both ArcGIS Pro extensions
Could you please have extension's installers check the installed version of Pro, and only update if there is a matching Pro version?