I still use WordStar for DOS 7.0 Rev. D — the final version, released in December 1992 — and have written all 25 of my novels with it.
I've created a massive archive for it. Included are not only full installs of the program (as well as images of the installation disks), but also plug-and-play solutions for running WordStar for DOS 7.0 under Windows, and also complete full-text-searchable PDF versions of all seven manuals that came with WordStar — over a thousand pages of documentation.
I've also included lots of my own explanations on how to use and customize WordStar, many WordStar-related utility programs, and numerous other goodies.
You can get the archive here:
https://sfwriter.com/ws7.htm