Yes, I have network 4 et al installed, too. I seem to remember a prog insisting it wanted NET 2, but when I went to download it, it took me to the 3.5 download automatically, so the later ones should definitely fill the requirements of the earlier versions.
If a program won't work unless it finds a certain version (say 2) I don't know what might happen.
I do get the ModelConverterX window appear and it looks just fine, but the error message is saying it is attempting to write to protected memory. It's suggesting my memory is corrupt, but this is not the case.
Strange
PS - I was definitely using this a couple of months ago to check paints. I took loads of screenshots, too, for the thumbnails.
Admin rights change nothing, Larry.
I've just tried a fresh 'install' on a different drive and it gives the same error.