@polluxi
You can download/browse all the release version on github under release section
https://github.com/ch2i/iC880A-Raspberry-PI/releases
Also all changes between version are indicated on each release.
I don't have the gerber files, it's done using the .brd file when ordering on PCBs.io or OSHPark, since it's done with eagle, you should be able to generate them with the free version (V7.7)