P3Dv3.exe APPCRASH cites MV_F-4E_sys.dll

[B52-K7]

I updated F-4E to run on P3Dv3.4.
When I started P3D & loaded F-4E, within 10 seconds of the cockpit view being on the screen I would consistently get a P3D AppCrash message
The Fault Module was given as: MV_F-4E_sys.dll

I have P3D on a P drive & I located MV_F-4E_sys.dll there. The file is described as:

MV_F-4E_sys.dll 10/7/2016 12.23 pm 2,529 KB P:\Lockheed Martin|Prepare3D v3\gauges

The Milviz F-4E .exe file, vA1.161007 that I downloaded for the F-4E update is showing as having 355,960 KB

I am wondering if the .dll is corrupt or whether anyone can spot anything that is wrong with the KB of the .dll or .exe?

This morning I moved MV_F-4E_sys.dll to another drive, tried loading the F-4E again, & now it works, can be flown.
Bit of a head scratcher.

My questions are:
Should MV_F-4E_sys.dll be back where I found it on the P drive?
Am I losing any F-4E functionality by quarantining it on another drive?
How do I fix the .dll if it is corrupt?
Thanks

[Krazycolin]

Did you disable your AV before you downloaded and installed the F-4?

Are you running P3D as an admin?

[B52-K7]

Did you disable your AV before you downloaded and installed the F-4?

Are you running P3D as an admin?

Yes & Yes.

I put the .dll back into the F-4E gauge folder & the following error message comes up when P3D aborts:

Problem signature:
Problem Event Name: APPCRASH
Application Name: Prepar3D.exe
Application Version: 3.3.5.17625
Application Timestamp: 5758bb31
Fault Module Name: MV_F-4E_Sys.dll
Fault Module Version: 1.4.0.8
Fault Module Timestamp: 57f63dad
Exception Code: c0000005
Exception Offset: 0002c59f
OS Version: 6.1.7601.2.1.0.768.3
Locale ID: 1033

Additional information about the problem:
LCID: 1033

[JonathanBleeker]

You are running P3D v3.3.5 when the required version is v3.4.9.

[B52-K7]

You are running P3D v3.3.5 when the required version is v3.4.9.

Well spotted.
Back to P3D to sort that out. I thought I had gone to 3.4.
Thanks

[B52-K7]

After wresting P3D3.4 onto the PC, pleased to report that the F-4E is now flying great.
Thanks