Delete old files?

Now that I’ve upgraded from AI-8 to Elements-9.5, can I safely remove the old AI program? And also remove the new Downloaded Install files? Lots of GB to save.
This may sound like an obvious “Yes”, but I’ve seen other programs go haywire when I removed older versions or the install files.
And is there a preferred way to delete them other Program/Uninstall for AI, & Select/Delete for the recently downloaded files?

Yes, you can. If you’re on Windows then the correct way to uninstall is using the Windows uninstall feature.

Make sure you’re quite happy that everything is working as it should be 9.5 before removing the old one, though!