Update error code 30088-27 Office 2021 what to do to get corrected????

I'm running MS Office LTSC Pro Plus 2024 Preview and my version is Build 2407 - Version 16.0.17830.20056.

When I try to manually update to 20166, I get Error 30183-27 (400). ...

Hi Peter SzS:

I'm not familiar with the Microsoft Office LTSC 2024 (Long Term Servicing Channel) Preview described in the 18-Apr-2024 BleepingComputer article Microsoft Office LTSC 2024 Preview Available for Windows, Mac since it's only intended for beta testing for commercial customers. See the Microsoft Learn support article Install Office LTSC Preview, which notes that "This preview program isn't intended for home users of Office".

That said, if you currently have Preview Version 2407 / Build 17830.20056 (rel. 15-Jul-2024) then the release history for the Insiders Preview (BETA) Channel at https://learn.microsoft.com/en-us/officeupdates/update-history-current-channel-preview suggests you should have received Preview Version 2408 / Build 17928.20018 (rel. 05-Aug-2024) if your automatic updates were working correctly.

If you need help manually updating your Microsoft Office LTSC 2024 Preview installation using the command prompt method described in my 12-Aug-2024 post <above> post back and let us know your operating system and current Office 2024 version number shown at Control Panel | Program | Programs and Features. I'm not sure if MS Office 2024 C2R version numbers still start with 16.0.xxxxx.xxxxx.

Dell Inspiron 15 5584 * 64-bit Win 10 Pro v22H2 build 19045.4651 * Firefox v129.0.0 * Microsoft Defender v4.18.24070.5-1.1.24070.3 * Malwarebytes Premium v5.1.7.121-1.0.5002 * Macrium Reflect Free v8.0.7783 * Microsoft Office Home and Business 2019 C2R Version 2407 / Build 17830.20138

Wanted to update community. After following the procedure in my previous post, today I attempted to update from within Outlook and was able to successfully update to latest version,17830.20166. As I stated then, I understand this does not work for all, but may work for some.

Check your Office settings and make sure that the Options > General > Privacy Settings.. screen has the "All connected experiences" option enabled so that you can then enable the "Experiences that download online content" option. (These are the steps for my Office 2016 Professional Plus running on Windows 10.) This should allow you to access the online Help system.

I was going to try this but when I hit the Privacy Settings button, the program crashes (Outlook, Excel, Word...). ??

Wanted to update community. After following the procedure in my previous post, today I attempted to update from within Outlook and was able to successfully update to latest version,17830.20166. As I stated then, I understand this does not work for all, but may work for some.

It's not going to work for ANY who it hasn't already worked for. It either works or it doesn't. If the latter, there's no solution until MS provides a fix.

I'm running up to date Win10 Pro and I tried the Cmd line per your previous post and got Error30183-27 (400).