I doubt that Greetings Workshop works on the Windows 10 because the software was released back in the 1996 which is a long time since then. The ISO with the application is still available on the Archive websites. You can download it for free since it's considered Abandonware, but to run it you'll have to install a virtual machine with the help of VirtualBox.
You can also use a tutorial to learn how to properly set up a machine to be able to run the program.
Note: A valid Windows XP installation disc or ISO is also necessary to install the operating system in the virtual machine.