There are several threads about this, but the fix is simple:
- go into the Official packages folder (it’s next to the Community folder. If you don’t know where the Community folder is, search the internet for “Microsoft Flight Simulator Community folder” and it will explain how to find this folder depending on where you bought the game from)
- go to OneStore under that
- delete the existing carenado-aircraft-pa44-seminole folder
- check for any .fsarchive or .fspatch files in OneStore that also refer to the pa44 and remove them
- restart MSFS
- go to Content Manager and re-download the aircraft