Wow, that's odd. They used to be PDF's, easily accessed.
I see no one has answered your inquiries yet. I'm no expert but would like to point out that you don't HAVE to convert your autochart live files that you recorded directly to your ZLC via the Autochart pro software. Your head unit should read them directly off the ZLC. Sonar recordings I believe do have to go through the software, but not the other file type. I have the Autochart software package, not the pro version, but once I'd converted my previous sonar recordings, I do everything from the ZLC, recording and viewing on the unit while on the water.