I have been using Easy Invoice by Armensoft for years. Does anyone know what happened to Armensoft and can I get an upgrade to run on Windows 7?
You can't get an uprade to make the application compatible with Windows 7 because there isn't one available. The official website does not exist anymore. If you still have the application, try to install Windows XP in a virtual machine then you can run it in that location. I would like to recommend you to use VirtualBox in this case to set up a virtual machine running Windows XP.