Thanks Tim.   I suspected as much.  I scanned the new PC installation with a number of utilities and they detected nothing at all.  I see my older PC where I was previously running Plan-G is still running Windows 10 version 1909, I'll see if it reacts the same way when it upgrades to version 2004.

Regards
Andrew

Firstly thanks for great piece of software.   
Been using Plan-G for a few years without any issues on a networked computer.  I'm reinstalling it on my main FSX PC.   No issues with the installation itself, but when I run the Plan-G.exe for the first run my AV detects it as a threat with the following report.

Path: D:\FSX Apps\Plan-G v3.2.2
File: Plan-G3.exe
Reason: Trojan:W32/CryptoRansomwareBehavior.B!DeepGuard

The same version was running on the other PC, and both PC's are running Windows 10 version 2004 and F-Secure Safe anti virus.

I suspect its a false positive, but puzzled why it is only detected on one machine.    I've messaged F-Secure but wondered if you had any other reports of false positives ?

Thanks
Andrew