I had Yosemite on my 2012 MBP and now I sold that and bought one of the new rMBP. I tried re-downloading Yosemite but it gives me an error during install. Anyway I can get a new code?
Are you sure you can actually install it onto the new rmbp? That came out after yosemite beta 1, so it is possible it won't install onto it (even with a non-corrupted installer).
I believe you need to cycle through all the DPs to get to 4, i.e.m, DP2, 3, etc.That's good!
When I get mine, I'll try DP1 (which is much older than PB1).
Then if that works, I'll update it to DP4.