Transferring a key (code) from one pc (no longer in use) to a new one

I have licenses for an old pc, where I have been running the versions from 2013 (Uipath runtime and Studio). I have tried to install a new version of uipath but my program needs a dll which is no longer available in the newer versions, so I need to keep using the old one. Can anyone please advise how I can just transfer the license from the old pc to the new one? I’ve tried to do a simple install but it won’t work.

btw, the old dll is Uipath.Interop.dll (not sure if it is relevant but there it is)