New
#11
Your post #9 screenshot shows that the computer came with Windows 7 installed on it, but we can't tell if it was Windows 7 Home or Pro. With that type of Windows 7 marker in firmware, there should have been a COA (Certificate of Authenticity) sticker on the computer which would have a product key printed on it, and also tell you the version of Windows 7 it would be good for. That will tell you which version of Windows 10 the upgrade was good for. On some laptops the COA sticker is actually under the battery.
Since you purchased the computer second hand and have now wiped out the activation information that was previously on it, we have no way of knowing how the previous installation of Windows 10 was activated on it. I would try installing Windows 10 Home on it and see if it activates from a previously stored Digital License. Not Single Language Edition, not "N" edition. Just plain Windows 10 Home. The plain Windows 10 ISO file you download from Microsoft will have both Home and Pro editions in it.
Regarding Neemobeer's posts, this is exactly why I stated that he was only partially in error regarding Windows 7 OEM. There are two types of Windows OEM activations. OEM:SLP and OEM:COA. The particular computer you have is supposed to have both.
OEM:SLP is the manufacturer specific disc that Neemobeer is posting about. It will contain the license for Windows 7 on the disc itself. The license won't activate itself, however, unless it finds the matching Windows 7 OEM marker in firmware. Computers that used OEM:SLP are supposed to also have COA stickers on them with printed product keys that allow the user to install and activate vanilla Windows downloaded from Microsoft - which is the second type of OEM activation that Neemobeer is in error about (or at least failed to mention).
OEM:COA activation uses actual product keys for Windows activation. The product key can be either printed on a label - or with Windows 8, 8.1 and 10 stored in BIOS/UEFI. An OEM:COA product key, whether it is printed on the label or stored in BIOS/UEFI, will activate the standard vanilla Windows downloaded from Microsoft.