Is the install just stalling or still throwing the .pkg error?

It seems like a lot of the reported issues with that file error have either been solved by swapping the memory or just repeatedly re-trying until it works. If you've reset your BIOS to defaults since installing all the hardware, I'd probably try under-clocking the memory slightly (if possible) for the install and see if that helps. If it is a mem issue, that may coax it through.