My version of the AV 19 updated automatically to v20 and bricked my W10 pc. Windows wouldn’t Auto Repair of any of the other usual options. Had to do W10 reinstall and restore from a few days old back up. All in all, a very tedious process. The sort of thing, ironically, that one does if a serious virus takes hold. I’ve stopped auto updates on the software versions (not the database) and will not update again until confident that such issues have been eliminated.