RA software is expensive and specialized and therefore very commonly pirated. You just have to fill out a form transferring the license to the new owner. Was the text file a *.LIC file, or just a TXT file with the serial numbers ? RA licenses are transferrable I do this all the time with software we purchase, use for development and installation, then sell to our end customers.
You can also try pointing the EVMOVECF.EXE utility (available from the RA Knowledgebase) at the ZIP disk. A ZIP drive, like the old 100MB IOMEGA ZIP drives ? That's a blast from the past ! If the ZIP disk didn't have a file called EVMOVE.SYS on it (try enabling Windows to show System files) then it doesn't have an old-fashioned EVRSI activation.