Given the large number of reports all at once, I would respectfully suggest that it's related to yesterday's update.
Yes, of course it's related to the update, but there's nothing wrong with it. As I've said, each time we release a new update, some antivirus blocks it by default, just because it's new. Please follow my previous instruction to the letter, including restarting Windows.
- Restart Windows
- Configure the Antivirus to exclude the whole Addon Manager from scanning.
- Run the Live Update again.