Problem description

Cannot install Japanese language package nor Microsoft IME on working computer.

Error messages:

Japanese IME is not ready yet.

Sorry. we're having trouble getting this feature installed. You can try again later.
Error code: 0x800F0954.

In a word, the working computer blocks communication with servers that installs language packages. For more detailed reason behind, one can refer to this blog.

Requirements:

1. Admin Rights (IMPORTANT! Without which you can CLOSE this page).
2. Microsoft Windows Client Language Pack for Japanese in a .cab file.
3. Microsoft Features On Demand (FOD) for Japanese language features in some .cab files. If one only need basic input of Japanese, a LanguageFeatures-Basic .cab file will be enough.

My enviroment & process

Env: Windows10 22H2 x64

1. Request Admin rights
2. Download required .cab files
   • Microsoft-Windows-Client-Language-Pack_x64_ja-jp.cab
     You can find and download it HERE
   • Microsoft-Windows-LanguageFeatures-Basic-ja-jp-Package~31bf3856ad364e35~adm64~~.cab
     You can download and extract it from HERE
3. Press Win+R, type lpksetup, install Microsoft-Windows-Client-Language-Pack_x64_ja-jp.cab.
4. Run Windows PowerShell as administrator, type:
   Add-WindowsPackage -Online -PackagePath <path of Microsoft-Windows-LanguageFeatures-Basic-ja-jp-Package~31bf3856ad364e35~adm64~~.cab>