Monday the Interface came back with new printing plate.
I re-installed everything, but the computer would not communicate with the Interface. It had found new software and installed that ok by itself.
Anyway, I was directed to info on Louet page and I found the info that I needed to change port com3 to com4. Problem solved and now they communicate again :-)
So, very happy, after the initial stress getting it to work again. Also very happy with the great service from Louet.