Oh, I see where the confusion is between us. I was not realizing you were not talking about something in the NewEgg ad.
The OS. These are "OEM" keys for Windows, not retail packages. They are licensed for use by system builders. You are purchasing a key, not media. You build your own installer media using an 8gb or larger USB flash drive from here:
https://www.microsoft.com/en-us/software-download/windows10. You would click on the "Download tool now." Make sure the USB stick is plugged in and then click on the downloaded media creation tool file. It will create a bootable Windows 10 installer on the USB stick.
Then, you use the USB stick to install Windows. I would suggest not using the OEM license key until Windows is installed and then using the "Change product key" option for activation. During the install process you have the option to choose, "I don't have a key" to bypass the need for entering a key in order to proceed with the installation. Once the installation is finished then you can activate using Control Panel>System. There is a link in the System window for activation or changing the product key. Choose the latter and then use the automated phone attendant to complete activation. Some consider using these cheap activation keys to be a gray area as the source for them is unknown. Were they originally purchased by a tech company who went out of business and is now selling them dirt cheap to clearing houses like URCDKEY? Are they pirated? You have to decide for yourself if you want to go this way.
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One thing to consider here about the OEM Windows keys. These clearing house companies like URCDKEY have been in operation for years in full view of everyone on the Internet and Microsoft has not closed them down. It it's illegal, why hasn't Microsoft gone after them?