Most likely a defective antivirus, that has mistakenly blocking some files from being updated (but not all of them), causing a mismatch of files from old/new versions, which can cause crashes.
- Download and install with the ANTIVIRUS DISABLED
- BEFORE launching P3D, configure the antivirus to exclude the following files from scanning:
YourP3DFolder\bglmanx.dll
YourP3DFolder\fsdreamteam\Couatl\Couatl.exe