Hey, we think this might be an issue specifically with Windows. If you shut down your machine while Cursor is open, Cursor is closed by Windows, but then proceeds to try and auto-update.
As this is a shutdown, the updater is killed by Windows after it uninstalls Cursor, but not before it installs the newer update, leaving you without a Cursor install.
This is just a theory and we are investigating this at the moment so we’ll hopefully feed back soon with a solution.