Thanks for coming back to me.
This is the first time I’ve installed the Spectrum Analyser on the Win10 machine, but I checked the Documents folder anyway (odd place for a program to keep .ini files?). There’s a folder called RSP Spectrum Analyser but it doesn’t contain any files.
I tried uninstalling Spectrum Analyser, manually deleting the Andrew Developments folder in C:\\Program Files (x86) then reinstalling it but it still won’t run.
As it runs OK on the Win7 machine I also tried Compatibility Settings but still nothing.