First of all, thank you for writing and maintaining this. I've just started learning about how WoW addons work, and thought I would have a look at the source code for this one to read and learn from.
I play TBC and through curse saw that the addon links to this repo, however the version that I see here on master seems to be for retail. Do you have any pointers about how this works?

Thanks in advance for the help and keep up the great work!

TBC version was never uploaded to Github. Can still be downloaded from the Curse page though.