Microsoft generally provides a "Retail" or "Volume" ISO publicly. However, the installation files are functionally identical. The difference lies in the channel identification files (ei.cfg) which dictate which keys are accepted.
Keep defaults (English, US).
No, the bits are identical. The difference is the license key type. An OEM key will not activate a Retail ISO and vice versa. However, the media itself is interchangeable. windows server 2016 standard oem iso download
That's it! You should now have a working installation of Windows Server 2016 Standard OEM. Microsoft generally provides a "Retail" or "Volume" ISO
Yes. Use the Microsoft Evaluation ISO and then activate it with the COA sticker key. However, note that OEM licenses are non-transferable, so legally you must ensure the seller transferred the license correctly. note that OEM licenses are non-transferable