Can anyone explain why a largely current install of Windows 11 24H2 fails to install language packs with Install-Language, but then install the latest cumulative update, and reboot it then works? This should work out of the box without updates, surely.

Sorry can’t answer why, but think it’s been like this for months. But I’m not surprised as 24H2 has been riddled with known issues since its release.

Same with Windows Server 2025, but it’s been an issue for several Windows 11 versions

I’ve been using that cmdlet in Windows 11 packer builds since forever without that issue, however the Azure images have the LCU installed, so that’s probably why

Yeah, with images I run WU first, then install LPs. This is mostly an issue for Autopilot. But it shouldn’t be an issue in the first place

The whole point of the cmdlet was to make life easier to install LPs, shame it’s not lived up to the billing. Takes ages to install them too in my experience.

Not exactly your issue, but I recently encountered another issue with the

Install-Language

command on Windows 11 24H2. After installing a language pack, the sysprep process took about 30 minutes, which caused problems with Nerdio since it times out after 15 minutes. I tested the same process on 23H2, and everything worked fine. We then used the ISO file method for 24H2 (Install language packs on Windows 11 Enterprise VMs in Azure Virtual Desktop - Azure | Microsoft Learn) and sysprep is now working quickly again.