I have tried for a long time to change Server 2025 26100 into Danish language This is one of the minor languages of Server 2025, and Server 2025 cannot be downloaded in that language. I downloaded the en-US version and tried to install the Danish LpCab language packs using this PowerShell command: Install-Language da-dk However it failed each time, no matter which build of Server. Then I used the Settings menu to install Danish language, but it was not complete, leaving english all over Then I read @Paul Mercer's surprising discovery, that en-US is broken in all Client and Server editions. I thought that the danish language pack was faulty, but this is not the case! https://forums.mydigitallife.net/th...2024-24h2-26100-x.88280/page-105#post-1855547 So I downloaded the German version of Server 2025 using UUP-dump and it was possible to install the Danish LpCab language packs using PowerShell After switching to Danish, I removed the German language using: Uninstall-Language de-DE It did however leave many german de-DE packages and there was also a cuple of en-US, but the en-US are probably UI language fallback So those I removed using DISM: Code: dism /Online /Remove-Package /PackageName:Microsoft-Windows-InternetExplorer-Optional-Package~31bf3856ad364e35~amd64~de-DE~11.0.26100.1 dism /Online /Remove-Package /PackageName:Microsoft-Windows-Licenses-ServerDatacenter-Package~31bf3856ad364e35~amd64~de-DE~10.0.26100.1 dism /Online /Remove-Package /PackageName:Microsoft-Windows-Licenses-ServerStandard-Package~31bf3856ad364e35~amd64~de-DE~10.0.26100.1 dism /Online /Remove-Package /PackageName:Microsoft-Windows-Licenses-ServerTurbine-Package~31bf3856ad364e35~amd64~de-DE~10.0.26100.1 dism /Online /Remove-Package /PackageName:Microsoft-Windows-MediaPlayer-Package~31bf3856ad364e35~amd64~de-DE~10.0.26100.1 dism /Online /Remove-Package /PackageName:Microsoft-Windows-MediaPlayer-Package~31bf3856ad364e35~wow64~de-DE~10.0.26100.1 dism /Online /Remove-Package /PackageName:Microsoft-Windows-MSPaint-FoD-Package~31bf3856ad364e35~amd64~de-DE~10.0.26100.1 dism /Online /Remove-Package /PackageName:Microsoft-Windows-MSPaint-FoD-Package~31bf3856ad364e35~wow64~de-DE~10.0.26100.1 dism /Online /Remove-Package /PackageName:Microsoft-Windows-Notepad-FoD-Package~31bf3856ad364e35~amd64~de-DE~10.0.26100.1 dism /Online /Remove-Package /PackageName:Microsoft-Windows-Notepad-FoD-Package~31bf3856ad364e35~wow64~de-DE~10.0.26100.1 dism /Online /Remove-Package /PackageName:Microsoft-Windows-PowerShell-ISE-FOD-Package~31bf3856ad364e35~amd64~de-DE~10.0.26100.1 dism /Online /Remove-Package /PackageName:Microsoft-Windows-PowerShell-ISE-FOD-Package~31bf3856ad364e35~wow64~de-DE~10.0.26100.1 dism /Online /Remove-Package /PackageName:Microsoft-Windows-SenseClient-FoD-Package~31bf3856ad364e35~amd64~de-DE~10.0.26100.1 dism /Online /Remove-Package /PackageName:Microsoft-Windows-Server-LanguagePack-Package~31bf3856ad364e35~amd64~de-DE~10.0.26100.1 dism /Online /Remove-Package /PackageName:Microsoft-Windows-SnippingTool-FoD-Package~31bf3856ad364e35~amd64~de-DE~10.0.26100.1 dism /Online /Remove-Package /PackageName:Microsoft-Windows-StepsRecorder-Package~31bf3856ad364e35~amd64~de-DE~10.0.26100.1 dism /Online /Remove-Package /PackageName:Microsoft-Windows-StepsRecorder-Package~31bf3856ad364e35~wow64~de-DE~10.0.26100.1 dism /Online /Remove-Package /PackageName:Microsoft-Windows-VBSCRIPT-FoD-Package~31bf3856ad364e35~amd64~de-DE~10.0.26100.1 dism /Online /Remove-Package /PackageName:Microsoft-Windows-VBSCRIPT-FoD-Package~31bf3856ad364e35~wow64~de-DE~10.0.26100.1 Good luck
en-US is broken for Server only (actually, the en-us components included with affected languages is the one broken per-se) the affected languages (cannot coexist with en-US LP) Code: ar-SA bg-BG da-DK el-GR en-GB et-EE fi-FI he-IL hr-HR lt-LT lv-LV nb-NO ro-RO sk-SK sl-SI sr-LATN-RS th-TH uk-UA LCU KB5043080 26100.1742 supposedly fix that issue (not yet verified), either: - use 26100.1742 refresh ISO (you need to reinstall LCU afterward) - install KB5043080, run Dism cleanup reset base to remove .1 components, then install new lang, and reinstall KB5043080 or newer LCU or the easiest / best solution, use ISO of non-affected language other than en-US
Just confirming - I didn't have any issue manually adding en-gb to the en-us 26100.1742 OEM iso (before I discovered W10MUI)
I installed en-US Server 26100.1 from UUP Dump and updated fully to 26100.2033 through Windows Update. And it's still not possible to install the Danish LpCab language packs using PowerShell :-(( So using en-US material and updating through Windows Update is not enough. We have to use @abbodi1406's laborious process... Edit: Installing the en-US 26100.1742 OEM version solved the problem, and it is now possible to install the LpCab language packs using PowerShell
No I haven't I'm just lazy and running the Powershell command to install a language post installation fits me quite well -
Installing 26100.1742 update (or later) is not enough, you must run Dism cleanup reset base to remove .1 components, before installing new lang using ready 26100.1742 ISO source works because it's already cleaned from .1 components
It may be another 24H2 bug but I had problems with sysprep using the powershell cmdlets to add languages. Might be a bit of a niche issue though