Open the installer on Windows XP. It will automatically install the necessary patches to allow XP to speak to the update servers.
A modern legacy update would have to walk a tightrope between security and breakage. The Helldiver spec sheet (leaked to this reporter via a PGP-encrypted text file) is both genius and lunacy. windows xp legacy update
Visit legacyupdate.net (on your modern PC) to get the checksum. Transfer the client via USB. Execute. Select "Custom" updates and uncheck "Windows Genuine Advantage" (WGA notifications are a nuisance). Open the installer on Windows XP
In 2014, the internet discovered a loophole. Microsoft continued to support (a POS system OS based on XP) until April 2019. The Helldiver spec sheet (leaked to this reporter
The Legacy Update feature was introduced to help organizations and individuals who still relied on Windows XP, but had not yet migrated to a newer operating system. Microsoft recognized that many businesses and governments were still using Windows XP, and wanted to provide a way for them to stay secure, even after the official support period had ended.
Automatically identifies and installs the hundreds of official security and stability patches released by Microsoft before support ended. POSReady 2009 Patches: