Don't know about Win 7 but for some amps windows 8 will not run things but in the pop up you can click run. Sounds to me like you tried to run the mac version of Blackhole installer.
Try this one Windows 64bit VST- http://www.eventide.com/~/media/Files/Audio%20Support/Plug%2 0Ins/Eventide%20Users/209189BlackholeVST1_1windows%20×64%20i nstaller.ashx
