Is there any documentation available for eCart 4.5.2?

When I first purchased eCart a few years ago, it was version 4 and I wasn't able to implement it so I set it aside until I had more time. Last November, I updated it to 4.5.2 and downloaded all the supporting files and documentation I could find. I finally have a free stretch of time now, but when I opened the GSG pdf, I found it's for version 5, and none of the help menus built into the app work (Flash errors, even when I instruct Flash to trust the location). Now I'm also concerned that ALL the support files I downloaded are for 5. I haven't been able to verify any of this from the file names.

I cannot justify the cost of repurchasing without first having some success with the version I already bought so I'm hoping I can get the 4.5 documentation.