Windows 8 Pro Upgrade from Windows 7 on Mac OS X - Boot Camp
Upgrading the windows 7 pro bootcamp partition on my mac book pro to windows 8 with the EUR29.99 version of windows 8 update was a little tricky. Hopefully these couple of pointers will save you several hours of trolling through knowledge base articles, forums and blog.
The trouble I has was that I did not have the required 20GB hard drive space but also required an existing version of windows 7 for the upgrade. Further trouble I encountered was not being able to choose a partition for the installation of the windows 8 pro upgrade.
With a little perseverance I got everything working, hopefully with these small tips a installation should be super easy.