You are aware that all git pull requests are saved right? whatever was there is easily downloadable from the github page, its all a matter of going through the requests and downloading the version before he removed those specific games.
I used the DDR A Update Pack and it works fine but I noticed in the readme.txt it says "Once extraction is done, go to contents/data/arc folder. You should see startup_v1.arc and startup_v2.arc files." I do not see those files.