How did LibreOffice delete itself from my computer?

I logged onto my laptop (a home computer) looked for calc and it wasn’t in Window’s tiles or anywhere else. I tried opening a calc file but obviously couldn’t recognise it.
How the hell did this happen?
I tried reinstalling it but failed cos it wanted admin rights. It crashed my windows bar btw so I restarted, reinstalled again and this time it was asking me for some sort of access to my kaspersky password manager.
Is this legit?
Would libre installation need such permissions to install itself?
I’ve installed it now and it works but I’m not sure if I’ve been hacked.

LibreOffice does not deinstall itself.