I got warned about low disk space on drive C: caused by PowerToys taking 7 gigabytes of stale upgrades: [Wayback/Archive] 396918165-154de37a-432d-4cab-84ee-0f5a54eb6575.png (1370×789).
PowerToys itself does not like this situation either: an update will quit without indicating why.
According to their issue tracker, this should have been fixed in v0.58.0* , but it wasn’t, see [Wayback/Archive] Update installed, but installation files not deleted. · Issue #13296 · microsoft/PowerToys · GitHub
So if you disk runs full, check out for a bunch of powertoyssetup-*.exe (why don’t they use Pascal casing for readability here?) files.
If you get chat notifications, then they will likely overwhelm the PowerToys notification that an update is available as Windows by default only can show the most recent 20 notifications, and it is hard to modify that default:
The Wiert Corner - irregular stream of stuff 