tomshardware[.]com/software/windows/windows-11-24h2-update-is-now-automatically-downloading-on-some-pcs
Microsoft's started automatically downloading & upgrading Win11 to 24H2 for those running earlier versions. So just a quick heads up to delay it if you want/need to, &/or maybe if the PC/laptop seems busy when you're not really doing anything, check Windows Update to see if that's what's going on.