I've had the same issue on my desktop and have tried a regular uninstall with Windows 10 and installing again. This version 5.9.3 (3169) has a popup about Apps that the version on my laptop (which is working) doesn't have. My laptop is running 5.9.1 (2581). When Zoom finally gets going on my desktop, I can't show video. So frustrating. But I'll look at your uninstall and install directions in this earlier response and hope it works.
EDIT: Your directions to uninstall were what I did and I installed from the same place you link to in your directions. Not sure what to try now. Help!
EDIT 2: I uninstalled, restarted my desktop computer, then installed Zoom again, still this same version. This time it let me click on the Stop Video but then it immediately froze and I never saw my video. Still need help!
I haven't been having the particular problem I reported here, the overall quality of the software seems to have significantly deteriorated over the last few months. I still have continual issues like getting no response to clicking on Share Screen, being dropped from meetings, random freezes, crashes where I'm not even doing anything. BTW, I've stopped checking for updates; I'm afraid they will just make things worse. So I'm currently still on version 5.9.3 (3169).
Hopefully someone from Zoom support will see that you and I (and SusanS) are still having difficulties and will respond. Good luck!