The Windows 8 RTM (the final version) is out! You will need a Windows Live ID (if you don't have one, sign up for one by clicking this link https://signup.live.com/signup.aspx?lic=1)
Okay, let's get started.
HOW TO INSTALL:
You will need a Windows 8 disc box (comes in 3 editions which are Pro, Normal and Enterprise)
A computer
An external DVD drive (netbooks, ultrabooks and ultraportable laptops)
1. Backup your files.
2. Insert the DVD disc (64-bit or 32-bit) in your computer/external DVD drive.
3. Shut down your computer and press F12 (or FN + F12, depending on your computer) at the BIOS screen.
4. Select the DVD drive (if you have the external DVD drive, select the USB)
5. Run through Setup.
6. Enter your Live ID and you're good to go.
7. Recover your backup from the DVD/external hard drive you made in step 1.
8. Install your stuff (except Adobe Reader, because you have the Metro PDF reader)
Done!
You can get it now for MSDN subscribers. (if you want to subscribe, you will need a Live ID)
If you want to subscribe, just search for MSDN and some instructions.