Hello, I have an old Win program, 3.1,95,98 that is no longer supported but does what I want. When I upgraded to Win 10 I removed it, now I can`t get it to install, Win 10 says no app available. I have now upgraded my backup pc to Win 10 and this time I left the program in place and it works fine. Will I have to revert the other pc to the original system, 7.1 install the program and then update to Win 10 or is there a way to get the program to in stall ?