Found some interesting bugs in the Windows 10 upgrade process:
- prior to upgrade I had Windows 7 with an (A)dministrator account and a regular (U)ser account, with parental controls for (U) set to disallow login after 8pm
- after the upgrade it was 9:30pm, and setup got stuck trying to log in to (U), since that was disallowed by parental controls but there was no way to skip the account or switch to another one
- I ended up changing the clock in the BIOS to make it continue, but after completing setup it turned out that (U) was now also an administrator (!)
- there appeared to be no parental controls anymore, so while (U) is still restricted, there's no way to change that
Still, I got my free Windows 10 upgrade, so I got that going for me, which is nice.