https://betanews.com/2020/01/23/windows-7-updates-0patch/

Sample quote

Using 0patch mean that you don't have to pay out a penny to Microsoft, but it doesn't necessarily mean that you will be able to keep Windows 7 updated and secure free of charge. 0patch offers three service tiers -- Free, Pro and Enterprise. The Free tier, obviously, doesn't cost anything, but no Windows 7 patches are guaranteed to be released for free. The company explains:

0patch FREE will continue to be available and we'll continue to add select micropatches to the FREE plan but we need to emphasize that 0patch FREE is by no means a suitable method for keeping Windows 7 and Windows Server 2008 reasonably secure after their EOS.

Despite the name, the Pro tier is suitable for both home and professional users and it includes access to both Windows 7 post-EOS patches and Windows Server 2008 post-EOS patches. Unlike Microsoft's Extended Security Updates, 0patch Pro is very competitively priced -- just $25.95 (or €22.95) per agent per year.

Clearly relying on a third party to secure your operating system requires something of a leap of faith and trust in a company you may be unfamiliar with. But over the years 0patch has proved its worth, and for anyone who -- for whatever reason -- is going to continue using Windows 7, its micropatches could represent the most cost-effective and sensible way of keeping the unsupported operated system secure.
End quote