Sorry to hear about the problem you are having. I had a similar problem with another piece of software, which partially uninstalled and then got stuck, half in and half out. Couldn't uninstall, couldn't reinstall.
Thanks to this forum and the one at DirectorZone, I was made aware of a software product that some of the pros here use called Revo Uninstaller Pro. There could well be other products, but I went with it and it will do a forced uninstall when stuff gets jammed. I have been very happy with the product and purchased it for the three computers in the house.
Please accept my apologies, Dafydd. I know that I am supposed to endorse products on this forum, but CL does not make a product that does this kind of thing and the user is just trying to accomplish a PD9 unistall so that he or she can reinstall. I will accept any punishment imposed, except please don't banish me - I am learning so much.
Hope this helps. Have a great day.
Regards,
-Phil
Windows 10 Pro x64
Dell XPS 8930
Intel CoreT i7 (4.6 GHz)
32 GB DDR4-2666 RAM
1 TB PCIe -x4 SSD
NVIDIA GeForce RTX 2060
PD14 Ultimate x64, 4207
CD4 Ultra and AD6 Ultra
Bleeping Computer Malware Response Instructor