The Lighting Controller

I'm new to ShowXpress, and I'm hosting karaoke at a venue that had it installed on a iMac in the DJ boot and preprogrammed with all the fixtures in the venue. It was installed by someone who is no longer working at this venue. I would just launch the software and click a few buttons and the lights would run and shut it down at the end of the night. Recently, they changed the iMac with a newer one and setup only 4 of the many fixtures. So I've taken it upon myself to learn ShowXpress and program all the lights. The problem is I don't know the addresses of all the fixtures. I'm trying to find out from the staff if the old iMac is still around in storage or something so I can export the previous programming, which I hope the fixture addresses are included. If this is not possible, is there a way to autodetect the addresses, or is climbing a ladder and check the address of each fixture the only way to find out?

Fabio Q.