Windows 8.1 install on my windows 7 thinkpad yoga S1 impossible

I just bought a Yoga S1 20CD-00E4FR win7 is the default OS and the recovery partition contain windows 7.
 There were 4 DVDs in the package for windows 8.1.
 I tried to boot with an external DVD and it works, but after I choose the language and agree terms there is a window with the title Product Recovery and the message is Recovery failed
 I tried to copy the DVD (with another DVD drive to be sure) on a bootable usb key and the same problem happens.
 I wonder if they give me wrong DVDs, or if the first DVD is corrupted, or if it comes from my new laptop hardware ? Is there another option to install windows 8.1 ?
Additionnal informations : They have numbers so you follow an order, the number 1 is windows 8.1 recovery media for windows 8.1 products (which is weird because my default OS is win7) the number 1 contain 2DVDs with the same title and you can read Disk 1 of 2 and Disk 2 of 2 on them.
Number 2 is Operatin System Recovery Disc Windows 8.1 Pro (OEM activation 3.0 required)
Number 3 is windows 8.1 recovery media for windows 8.1 products
I tried to boot on another DVD but it only boot with the first one (disk 1 of 2 only).
I can clearly read on my seller's website Microsoft Windows 7 Professional 64 bits installed + Windows 8.1 Pro 64 bits licence So I guess I am supposed to be able to install windows 8.1 without troubles.

Does the surface of the DVD look damaged? Maybe try a surface test on the media?
https://www.raymond.cc/blog/test-cd-or-dvd-readability-by-running-surface-scan-and-file-test/
W520: i7-2720QM, Q2000M at 1080/688/1376, 21GB RAM, 500GB + 750GB HDD, FHD screen
X61T: L7500, 3GB RAM, 500GB HDD, XGA screen, Ultrabase
Y3P: 5Y70, 8GB RAM, 256GB SSD, QHD+ screen

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    The Windows installation starts. Follow the on-screen instructions as normal. The installation program will restart your computer one or 2 times. Don't forget to press ALT (option) right after the bootup sound, and boot on Windows again each time to continue the installation.
    Step 5: Install bootcamp drivers
    Once the Windows installation is complete, plug in the USB stick where you stored the bootcamp drivers (see "what you'll need" section), open it and right click on "setup.exe" and select "Run as admin". Follow the on-screen instructions.If you have an error saying that you can't run this program on this PC, obviously you have installed a 32 bits version of Windows and the bootcamp drivers for your Mac are made for a 64 bits version. You have to restart the whole guide and make sure to get a 64 bits version of Windows this time!
    Once the bootcamp drivers are all installed, reboot and press ALT (option) after the bootup sound to boot on Windows again. And Voilà, you have Windows installed on your USB3/Thunderbolt drive running on your Mac.
    Now each time you want to boot on Windows, press and hold the ALT (option) key after the startup sound and select "Windows", then press Enter.

    Hi i'm trying to follow your guide, I installed windows 8 on bootcamp to do it planning to remove it after the operation is done, but i get stuck at part 3: every command i give to imagex i get a pop-up ftom windws asking how do I want to open this kind of file install.wim and imagex does nothing, what do i have to do to stop those pop-ups?

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