Hi. @ Dave Leesley.
As I said in my previous post on here, I use Avast!
PFE and accumulative updates to 2.14 always installed with no problem, and PFE always ran fine. It also did the auto update with no problems whatsoever. Avast did not interfere with PFE at all!
It was only the FsBuild 2.4.0.20 update problem that brought this to mind, so I thought it was worth mentioning! Avast actually deleted the FsBuild executable, as well as deleting the shortcut! That is why I mentioned that I had to put an exclusion in Avast, because every time I tried to run FsBuild, Avast intercepted it and deleted the executable file and the shortcut!
As it turns out, the PFE 2.15 update also seems to be getting picked up by some antivirus programs and stopping the auto update, and the manual update!
I do not know if other antivirus programs also prevent PFE from actually running once updated to 2.15, and also deletes the PFE executable, the same way Avast does with the FSBuild 2.4.0.20 update!
Hope this clarifies.
Rgds.
Terry