When trying to install PTVSIntegrated.exe IE10 or newer has to be installed. Otherwise the installer refuses to continue. But Microsoft removed this requirement from their installers some time ago:
I verified this by manually installing:
and installing PTVS 2.0 on top of it without any issues on a Windows 7 System with only IE9 installed. It just shows a warning that certain functions won't be available without IE10 but I didn't notice any problems.
So may be the PTVSIntegrated Installer could be rebuild with a newer SDK or something to also drop the IE10 requirement?