I have an old portfolio management program on my PC. I have upgraded to a new PC and tried to migrate the program to the new PC using Easeus Todo. The program migrated OK but will not run on the new PC and I get an error message that " The registration has been tampered with. The serial number does not match this hard disk". The program was a software download and I am unable to buy a new license for the new PC. I know I can clone the hard drive from the old PC to the new PC and the program will probably work. However I do not want to do this as the old operating system (Windows 10 home) is bloated from years of updates etc. and my new PC has a fresh install of Windows 10 pro. I have already migrated all the files and folders I want to keep. Can I transfer the old hard drive to the new PC and use it solely to run my accounting program as well as have some extra storage? Or will the old OS cause conflicts with the new one? Thanks in advance for any help. P.S. I do know how to use the bios to set the boot priority.