MAV when trying to update CB to 1.3.11

Let me start by saying that I've never had a MAV before with this game.
This morning, I tried to update to version 1.3.11. The update goes fine until the extraction gets to file SFX/Step/StepPD3.ogg
The game itself starts fine; this only happens when I try to update.
I've tried all the tips on the forum post on dealing with MAVs. I also tried turning off my antivirus since it has been pretty strict before. But the issue still happens.

What should I do?