Thanks - actually what happened was Avast sent links to the incorrect package to download, it was actually Pro rather than EndPoint Protection. I downloaded EP V8 instead and this seems to be working fine with Windows 8.1. As far as the ini file goes, don’t get me started - 4 months of wrangling with Avast reps because it wouldn’t work, they really just kept trying to off the problem and pretend it wasn’t an inherent issue with Avast, before a dealer informed me that it’s not even necessary to do this and we found another way.

Thanks for the reply though JayZ.