Hi Marco,
Please use the Language and FOD ISO to install zh-CN LP offline.
Download 26100.1.240331-1435.ge_release_amd64fre_CLIENT_LOF_PACKAGES_OEM.iso
Mount the ISO. Suppose the ISO's drive letter is F:. Run the following commands from Command Prompt admin.
Dism /online /Add-Package /PackagePath:"F:\LanguagesAndOptionalFeatures\Microsoft-Windows-Client-Language-Pack_x64_zh-cn.cab"
Dism /online /Add-Package /PackagePath:"F:\LanguagesAndOptionalFeatures\Microsoft-Windows-LanguageFeatures-Basic-zh-cn-Package~31bf3856ad364e35~amd64~~.cab"
Dism /online /add-capability /capabilityname:"Language.Basic~~~zh-CN~0.0.1.0" /source:F:\LanguagesAndOptionalFeatures
Dism /online /add-capability /capabilityname:"Language.Handwriting~~~zh-CN~0.0.1.0" /source:F:\LanguagesAndOptionalFeatures
Dism /online /add-capability /capabilityname:"Language.OCR~~~zh-CN~0.0.1.0" /source:F:\LanguagesAndOptionalFeatures
Dism /online /add-capability /capabilityname:"Language.Speech~~~zh-CN~0.0.1.0" /source:F:\LanguagesAndOptionalFeatures
Dism /online /add-capability /capabilityname:"Language.TextToSpeech~~~zh-CN~0.0.1.0" /source:F:\LanguagesAndOptionalFeatures
See also:
How to Install Chinese (Simplified, China) Language Offline
Standard Disclaimer: There is a link to a non-Microsoft website. The page appears to provide accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as PUPs (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.