No, I do not have a backup on my PC. TRANE says that they will sell me one for about $1000.00. I can't afford that. I would have thought that they would have left one here but it looks like they did not. All I want to do is to connect to the BCU and upload a new database and continue to program from there so I can get the building back from there. I did obtain a licensed copy with proper registration. I got it from the ebay for $1000.00. Thanks for any help you can send me.