I have recently aquired a Mac Pro G5 Dual 2.0 GHz with 2 GB ram from a friend of mine who upgraded. He wiped the drive before selling it to me and told me that I could get software for it from EBAY (thought he still had disc when he wiped the drive). I am new to Mac and before ordering I ask the seller if this would work on my machine and they said yes it was the right software, now I have tried on several occasions to load and it boots up (me holding C down) to the loading software screen and ask me the language to install, once I answer that it pops up Mac OS X cannot be installed on this computer. What am I doing wrong and what can I do to fix this issue. This software cannot be installed on this machine