I've been able to run this program on 64bit windows. Although, you will need to initially get it installed in 32bit windows (Windows 7, you can download/use XP mode. Windows 10 you may need to use VirtualBox and install XP). Once installed and licensed, I copied the "c:\program files\ProventureInvoices" into the "C:\ProgramFiles (x86)\" folder on 64bit windows and was able to launch EasyInv.exe. I've done this on Windows 7/8/10.