Maybe a stupid question, but...

... I'm about to update from 4.20 to 4.21 through Install Manager. Is there a way to keep all user settings? (Workspaces, my custom shortcuts, /scripts menu, etc.).
I remember that after migrating from one of the previous versions to 4.20 I had to re-do everything I mentioned above...
Comments
No, you don't need to do any 'user settings migration' after such an upgrade (from 4.20 - 4.21), they won't be changed. Btw, all the user custom settings are in the folders: '%AppData%\DAZ 3D\Studio4\' and '%AppData%\DAZ 3D\Studio4 Public Build\', you can back them up, just in case...
You usually don't need to do anything to keep those after updating. If there's something missing, usually reapplying your saved layout and using "Window>Workspace>Update and Merge Menus" is enough to fix it.
Another thing is that if you install a beta it won't have the customizations you made in the general release and vice versa, as they have different settings.