Where can I find changelogs for each version of TGEA?

When I purchased TGEA I downloaded versions 1.7.0, 1.7.1 and 1.8.0. Now I'm busy trying to learn the script and using the various builders.

I've also looked for books, tutorials and resources for version 1.8.1. I'm quickly finding out that there really isn't much in the way of books or resources for ver 1.8.0. It seems the books available are written for ver 1.3 - 1.5.

Every resource I've found that I wanted to implement into my game seems to be the same way, written for versions 1.5 on down.

Even L3DT Pro which I purchased isn't compatible with 1.8. I have to import the maps to 1.7 then transfer them to 1.8 (If I'm understanding this fix I found correctly).

Anyway, the point is, if there isn't much of a difference between the earlier versions and 1.8, or the upgrades from previous versions aren't anything I'll be using, I could save myself from headaches by using an earlier version. Thus the reason I'm looking for the changelogs.