darktable 3.8 flakey, where can I find the last 3.6 for windows?

I see the .lock files…but have checked in task manager and there is no sign of dt. Am I DOOMED ?

Also, I have tried copying the renamed back-up files, but it won’t let me paste them onto the existing library and data files…and I’ve tried deleting the exisiting files but they just pop back up…

There must be a way…but I jave no idea what it is.

PS Have restarted the PC and that makes no difference.