Old dui 2007 prventing drivers licence reinstatement now

so you completed deferred prosecution but never appeared at court to finalize it is my understanding of your question. if the agency closed down, you may be able to contact a former therapist or administrator to write you a letter stating you completed their program. i recommend going to the court and examining what's in your file, talking to your attorney who was on your case, and getting as much evidence as you can. an attorney may be able to help you with this.

Is the agency that you did the treatment at a chain where there is an office of that agency in another town?

If the court or probation received a copy of your completion report, you can get it from them.