Since the latest Optisystem version is v. 13.0.3 (and not 13.0.0), you are not able to open the osd files that Dhiman and I have created using Optisystem, as we are using version 13.0.3. You can uninstall your version, download version 13.0.3 and install it. Your 30-day trial deadline will not be reset, though.
Regards