In-place upgrades for Windows 10

For the non-OSD method (for instance if you only have BigFix Patch and not LifeCycle), check one of these fixlets (assuming English, but we also have many other languages) in the “Patches for Windows” Site:

1111556	Windows 10 Business Editions Version 20H2 Available - Windows 10 (x64) (English-United Kingdom)
1111574	Windows 10 Business Editions Version 20H2 Available - Windows 10 (x64) (English (United States))
1111553	Windows 10 Business Editions Version 20H2 Available - Windows 10 (English-United Kingdom)
1111572	Windows 10 Business Editions Version 20H2 Available - Windows 10 (English (United States))
1111518	Windows 10 Business Editions Version 2004 Available - Windows 10 (x64) (English-United Kingdom)
1111517	Windows 10 Business Editions Version 2004 Available - Windows 10 (x64) (English (United States))
1111507	Windows 10 Business Editions Version 2004 Available - Windows 10 (English-United Kingdom)
1111510	Windows 10 Business Editions Version 2004 Available - Windows 10 (English (United States))
1111415	Windows 10 Business Editions Version 1909 Available - Windows 10 (x64) (English-United Kingdom)
1111414	Windows 10 Business Editions Version 1909 Available - Windows 10 (x64) (English (United States))
1111482	Windows 10 Business Editions Version 1909 Available - Windows 10  (English-United Kingdom)
1111427	Windows 10 Business Editions Version 1909 Available - Windows 10  (English (United States))

The Description tab of each of these fixlets has additional instructions you’ll need to follow. They mention which OS editions can be upgraded:

This Fixlet requires downloading the Windows 10 ISO image before deploying the Fixlet. You can use a custom repository to do so. Once this Fixlet completes, restart the target to complete the upgrade process. 

The business edition ISO contains the following Windows editions: 

Windows 10 Pro 
Windows 10 Pro N 
Windows 10 Pro for Workstations 
Windows 10 Pro N for Workstations 
Windows 10 Pro Education 
Windows 10 Pro Education N 
Windows 10 Education 
Windows 10 Education N 
Windows 10 Enterprise 
Windows 10 Enterprise N 

What I see sometimes is not clear is that you have to obtain the ISO image first, from your Microsoft Volume License Service Center (VLSC) account. Your download should match the size/sha1/sha256 of the ISO listed in the Fixlet, or you might need to create a custom copy of the Fixlet to update those values if the ISO image has changed and our fixlet hasn’t caught up yet.

Right now for 2004 English - US we are using the ISO image “en_windows_10_business_editions_version_20h2_updated_nov_2020_x64_dvd_e5d7759b.iso” which I think is still the latest.

The Description tab also goes a bit more into increasing the download cache sizes of your clients which may be necessary.