Go here first, if you haven’t done so yet. This where I started.
One thing will lead to another. Decoding of STD-C EGC will not be handed to you freely. (It is free, but you can pay and be a dummy) You have to be a Google detective. I was & successful. When I downloaded a couple years ago, the site said something like “This site has a big virus, leave now”! Just continue. But your PC may have to be fiddled with, security wise. No more questions please,