Server is crashed, how to install netexpress (and license) when backup is copied to new server

our server that was running netexpress crashed.
We have now copied everything from a backup to a new server, but now cobol compiler no longer works.
How do I get that working again?
I think the license number is not found.
Should I reinstall that instead of just copying it to the program files folder ?

when i try to run cobol.exe I get

error code: 109, pc=0, call=1, seg=0
109 Your product license has expired

make: *** [objects/hlrekagt.obj] Error 32

But the license is not expired, but not found I think