Said It Here

Can you install Windows 10 ESU updates without a subscription?

Windows 10 Extended Security Updates (ESU) cannot be installed by downloading them manually from the Microsoft Update Catalog on unregistered PCs. Attempting to install them without official program enrollment results in the installation failing entirely, preventing unsupported systems from receiving security patches.

What people tried

Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.

  1. 1
    Putting in a ticket
  2. 2
    Buying the license and deploying the MAK to managed devices
  3. 3
    Upgrading the operating system instead of sticking with older versions

In their words

Unedited, most upvoted first, each linked to the thread it came from.

Can anyone confirm if it's possible to just download the various Windows 10 ESU updates from the Microsoft Update Catalog website and install them on a PC that's not part of the ESU programsource ↗

HarryMuscle · r/sysadmin · 3 upvotes

Yes, we’ve tried it. No, they won’t install.source ↗

viper_16 · r/sysadmin · 1 upvotes

Where this came up

People with this problem also raised