My personal solution:

I upgradet 2 PC to W8.

After paying, I got the product-code for the first PC.
By the first PC the installation was succesfull.
I made a copy on a memorystick from the W8 installation files.

Then I payed a second time and got the code for the second PC.
By the second (XP) PC there was the problem with the installation of Windows 8
The screen asked: "Change the folder or file name"
But it is impossible to change

Then I used the memorystick with the files from the first PC and installed W8 by clicking "set-up"
Ofcourse I used the product-code from the second PC.
And it works 100%

In the confermation mail you can also order the Original installation DVD.
And then BOOT from installation DVD.

Good Luck