Sorry to hear about your issue!
Have you tried updating it through the Creative Cloud Desktop app?
See this doc for more info - Update Creative Cloud apps
Let me know how it goes.
Yes, I've tried that - when I open the CC Desktop app, I get a blue button saying "Install Adobe Apps", but clicking it doesn't do anything. There also isn't any option to update as described in the doc you shared.
I just read that XD is now out of Beta - is that related?
Please send me your Adobe ID, location, and phone number along with a link to this post over a private message. To send a private message, click my picture and use the Message button. We will get in touch with you for investigation.
Sorry to hear about your issue.
Can you please attach the content of error log file so we can have a deeper look into it?
The files can be found in t his location - Find launch log files | Adobe Creative Cloud.