You can download ProDiagnostics 2.1.1 from our software library for free. This free software is an intellectual property of HVAC-Pro. The program belongs to Education Tools.
From the developer:
ProDiagnostics software is a free interactive HVAC Training Program with 50 diagnostic problems both HCFC-22 and HFC-410a.
You may want to check out more software, such as GuitarTrainer, PrepLogic Exam 70-290 or Guitar Concept, which might be related to ProDiagnostics.