Surcode Adobe Premiere Can Someone Help Me With An Audio Problem I'm Having With Adobe Premiere Pro?

Can someone help me with an Audio problem I'm having with Adobe Premiere Pro? - surcode adobe premiere

I have Adobe Premiere Pro v. 1.5. I have a few films for my film class, and export to DVD 5.1 surround. The problem I have is the 5.1 Dolby Digital Encoder (SurCode of Minnetonka Audio) was obviously a trial version and now can not export audio mixing in surround sound for me. Does anyone know of another was 5.1 encoder also be used, or a way to solve this problem, the study? I am a student, so you do not pay for the key program of $ 250. Please help! I will send a film on the festival circuit, but I have my audio work. Thank you.