Lost Win8 setup files

I downloaded and installed Win8 Pro several months ago (a year ago?) when it was priced at about $40. I used it for several months and was reasonably satisfied with it. But LogMeIn ws not compatible with Win8 at the time, so I uninstalled it and returned to Win7.

Since the time I uninstalled Win8, the external HD that the setup files were stored on crapped out and I lost everything on it. I do have the activation code. My question is whether or not I can re-acquire a genuine copy of Win8 without having to purchase another copy of Win8 Pro?

Thanks in advance for any help.

Scott

When downloading the upgrade you need to

http://www.eightforums.com/tutorials/18309-windows-8-upgrade-iso-download-create.html