Anyone by chance have any brilliant ideas on how someone whose ISP blocks P2P could patch the game?
You should probably get an ISP that isn't violating FCC regulations on internet traffic... just sayin'
I'm not sure you have a recourse here. The retail version will undoubtedly have non-P2P options such as full package downloads of the uncompressed client (probably not from SE but I'd be shocked if others didn't set them up)
I do know that if you can find someone irl that has the game you can just copy it from them. I installed it on my laptop by just pushing it across my network here and it works perfectly fine.