Hi, if someone has already posted this trick, please delete this topic. I've searched, but don't find something similar. First of all, I think there are people here who have tryied to install the RTM from MSDN, but before to begin the setup proces they were asked for a key. If you don't have a key, setup cannot continue. Leaked keys from WZOR are not accepted. So if you want to test Windows 8, the only option is to install the Windows 8 Enterprise Evaluation Trial. I compared the content of the Retail ISO from MSDN and the Trial, and I've noticed one thing: The Eval version seems to have one more file in the source folder. By comparing them file by file, the result is the (in)famous ei.cfg which should be removed in Windows 7 builds to give you full acces to all versions from disc. The MSDN/TechNet versions don't have it, but the Eval Have it, and the Eval don't ask for a key. Just by ading an ei.cfg file with the folowing content in the source folder of a Retail MSDN image: The setup will not ask you anymore about a key, and will give you acces to select wich version you want to install - Core or Pro. The setup will then continue as for Windows 7. At a certain point after install it will ask you for a key but you may skip this step, and you are in. Please note that [EditionID] should be left blank in order to let you select between the Core and Pro versions. Also in the [Channel] field you may use Retail ( as shown ) but also Eval or OEM. Also, please note that this only let you install those versions, but you will still need to enter a key in order to activate Windows. It's just a workaround, also needed if you want to create an Windows 8 AIO disc. You will still get a nag screen asking for activation ( some seems to skip this by removing/renaming the slui.exe and slui.exe.mui from Windows.