I am not a technically-oriented person when it comes to computers, and the latest Mid's update has posed a challenge for me, but with a little assistance I was able to get it to work. so I'll share what I did, with one caveat: I really don't understand why/how it worked.
1. I used my computer's Control Panel to completely uninstall Mids.
2. I used File Explorer to search: MidsReborn
3. I deleted everything that came up in that search, and emptied my Recycle Bin.
4. I installed the dot net 8 that was mentioned. There's a link in Mids Reborn Discord Announcements.
5. I thought this had fixed my problem, but when I closed Mids and reopened, it reverted back to the previous database and told me my build was created with a newer version,.
6. I tried updating the database both from the prompt and by using the Help to search for new updates. The updater failed on both occasions.
7. I went back to Mids Reborn Discord Announcements and saw that I also needed an updated C++redistribuable, whatever that is. (AKA Bootstrapper)
8. I checked my version and saw it was 2015-2019 and that a newer 2015-2022 version could be obtained by clicking the link in the Mids Reborn Announcement.
9. I installed the C++redistribuable 2015-2022, and restarted my computer when prompted.
10. I opened Mids and this time the update took just fine. I closed and reopened just to make sure.
For anyone with my dismal lack of computer skills or better, I'm sure you'll be able to get Mids updating correctly again. I hope my non-technical post helps you in some way.