Can't install Resharper 7 on Windows 8 x64 RTM / VS2012 RTM

Hi,

When I try to install the latest MSI off the jetbrains.com site, I get

"This installation package cannot be opened. Verify the package exists and that you can access it or contact the application vendor to verify this is a valid Windows installer package"

I've tried running it in compatability mode and also tried repairing the MSI but no problems were found.

Any ideas what could be wrong? I'm running it within a VMWare Fusion VM if that makes any difference

Thanks

James