Install Windows 8.1 Pro from Recovery

I purchased a new W541 machine, knowing that I wanted to install the OS on a new SSD, and not the drive that came with the laptop. The sales person I spoke with mentioned that I should go with Win 8.1 through downgrade rights on Win 7 Pro. In this case, the recovery disk(s)? would come with the laptop and the laptop would have Win 7 installed on it.
However, upon arrival today, there are no such disks. I called tech support and they are going to ship them out. As I understand it, the license key is intergrated into the machine. Can I only install the OS from the Lenovo provided disks, or can I get the iso from Microsoft and install from that?
Thanks!!
Solved!
Go to Solution.

All good. I had a clean ISO on a USB stick and installed from that. It was able to find the Windows 8.1 key from the BIOS, so it looks like all is well

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