Microsoft said that if you installed Windows 8 Release Preview on top of your previous installation (Windows 7, Vista or XP), or you did a clean install because of the previous version of Windows, you still qualify for the upgrade offer. Now, for example, if you installed RP on a Mac OS X, you will have to pay for a full version of Windows. Remember that the cheaper upgrade path will be available on the web as a downloadable media at the time Windows 8 releases in the coming months. An exact date for the final release is yet to be announced, but it could be as early as mid-October, according to online rumors. Source The Verge All content on this site is provided with no warranties, express or implied. Use any information at your own risk. Always backup of your device and files before making any changes. Privacy policy info.