The zip file contains 9 files. They should be opened in same folder. Click on the exe file and it will take care of the rest of the process. Reboot your machine. When it looks for OptiAudio 16, in the file option, point it to the directory where the files are upzipped. There you go.
It took half a day to locate this file. Save it on a zip drive for future reference. Good luck. Happy to share this one!