How many of you have been prompted to remove previous versions of your software upon installation of a newer version ??

Prompted by who or what? Never seen such prompt.

Edit: we use AEC Collection. Most programs we use (AutoCAD, Revit, Navisworks, ReCap, 3DS Max) can be used side by side. Only exception is ReCap - it installs the latest version over the older version without questions or warnings.