I mentioned the client in there (4th paragraph), but mine was more of a general rant on the overall low effort that seems to have been put in to figuring out what the actual problem was. And that it is relatively common among people in the self hosting community to assume that Nextcloud is a lot simpler than it is. It’s a huge cloud suite consisting of many applications, clients, plugins, proxies, caching, database, etc. You need to have a pretty good understanding of how it all works, and how to investigate a problem, and ideally you should be testing before upgrades. Large companies often even test endpoint applications like the desktop client and push out only tested versions to users via policy or some kind of endpoint management.

I can’t really draw many conclusions from the very little information provided in this post, but I suspect OPs windows machine is not in an entirely stable state, which is what is causing some of these update issues.

And, I put some of the blame for Nextcloud under-representing it’s complexity on Nextcloud’s marketing and AIO. You absolutely can install it without understanding anything, and that’s a little dangerous in my opinion because it is actually quite complex and you will probably end up breaking it at some point and need to dig in to fix it.