Windows 8 oem redownload iso

Hey guys got a question. I received all the parts for my new htpc today. everything went together without a hitch. got to the part where i pop in the windows 8 oem disc to install, and i scratched the crap out of the disc with a kitchen knife i was using to cut tape with. Now the install will not succeed because the disc is damaged. Does anyone have insight as to what I can do to get a downloaded image of windows 8? I found a download tool on MS that allows you to enter your product key and it will initiate a download, but it says my product key isn't eligible for that download. Should I just torrent the disc since I'll use a valid PK anyway? Luckily the new htpc runs linux really well

Thanks for all the tips! I was able to work it all out and get windows 8 on there. Now i have new stupid problems. I tried out xbmc with nextpvr backend, and the performance is absolutely horrible when viewing live ota content. video stutters all over the place and the experience is horrible. Another crazy thing i realized (my own fault for not researching ahead of time), but I have no option to install windows media center unless I upgrade to "windows 8 pro" for another 100 bucks, then I get the privilege of spending an additional 10 just to get wmc. I honestly just thought it was just a 10 dollar upgrade from my oem copy. I just want to say that I'm really glad I decided to opt for the OS upgrade so i could have less features. I guess my best bet at this point is to hopefully find a way to make xbmc/nextpvr behave and give somewhat decent performance. So far this downgrade in software quality over my previous setup (an old laptop) isn't passing the Wife Acceptance Test. Anyone got any ideas on this one?