Windows 10 build 19042.264

Windows 10 build 19042.264 is the earliest known build of Windows 10 October 2020 Update. Build 19041.264 contains components related to the 20H2 update.

Upgrade instructions
The components can be manually installed by running the following commands from an elevated command prompt: for %s in ("%windir%\servicing\Packages\microsoft-windows-*-20h2-ekb*-package*10.0.19041.264.mum") do dism /online /add-package /packagepath:%s

for %s in ("%windir%\servicing\Packages\microsoft-windows-*-20h2-ekb*-package*~*-*~10.0.19041.264.mum") do dism /online /add-package /packagepath:%s

By installing these packages, the operating system will report itself as version 2009 and build 19042 instead of 2004 and 19041 respectively.

Installing the components in this fashion only changes the version the operating system identifies as, it is by no means a functional substitute to a proper enablement package.