question

HI WwW-1112,

1.Could you please run below command on issue win10 and share us the picture?
Are Chinese (Taiwan) and Japanese installed on your win10?

2.If we create a new local admin account on problematical win10 and logon this new local admin account, will the same issue happen?
Create a local user or administrator account in Windows 10
https://support.microsoft.com/en-us/windows/create-a-local-user-or-administrator-account-in-windows-10-20de74e0-ac7f-3502-a866-32915af2a34d

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Here is the capture of the IME issue after updated 21H1.

Both Chinese (Taiwan) and Japanese has been installed before update, but not found after updated 21H1.

Even logon with new administrator account, IME issue still existed.

HI WwW-1112,

1.From your picture, I think you run wrong command, please run below powershell command again and share us your picture, thanks for your cooperation.

2.Please run below command in command prompt(open as admin) then check if it can find and solve system file issue?

sfc scannow
dism /online /cleanup-image /scanhealth
dism /online /cleanup-image /restorehealth

3.Please check if there is file missing in this location (Windows\IME\IMEJP\DICTS) of win10(21h1),
if we find windows.old file in disk C on win10(21h1), we can try to copy them to this location (Windows\IME\IMEJP\DICTS).
if we can't find windows.old file in disk C on win10(21h1), we can try to copy them from other working win10 pc which install the same language package.

Current IME is not ready yet
https://answers.microsoft.com/en-us/windows/forum/windows_10-other_settings/current-ime-is-not-ready-yet/758de532-7d66-49d8-843d-451a8a1fe786
Windows.old\Windows\IME\IMEJP\DICTS to Windows\IME\IMEJP\DICTS.

4.If the problem still persist, please open Command Prompt as Admin and do below steps:
(1)Now type the following commands to stop Windows Update Services and then hit Enter after each one:
net stop wuauserv
net stop cryptSvc
net stop bits
net stop msiserver
(2)Next, type the following command to rename SoftwareDistribution Folder and then hit Enter:
ren C:\Windows\SoftwareDistribution SoftwareDistribution.old
ren C:\Windows\System32\catroot2 catroot2.old
(3)Finally, type the following command to start Windows Update Services and hit Enter after each one:
net start wuauserv
net start cryptSvc
net start bits
net start msiserver
(4)Delete your chinese language and Japanese lanaguage like picture

(5)Reboot your server to save changes.
(6)Reinstall your chinese language and Japanese lanaguage then check if there is error prompt and check if the IME can work.

If the issue persist, please check if below document can help you.
Fix Error 0x8024500c When Installing Windows Updates
https://appuals.com/0x8024500c-try-that-again/
Please Note: Microsoft provides third-party contact information to help you find technical support. This contact information may change without notice

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HI

From below picture, I think your chinese language and Japanese language have not been installed successfully for current user.

1.Is there proxy or Network behavior management in your environment?

2.Is there WSUS or SCCM in your environment to control update patches?

3.Is it possible to connect your issue PC to home network(none company network)then download the language and install language again?

4.when we run below command, all command display successfully ?
sfc scannow
dism /online /cleanup-image /scanhealth
dism /online /cleanup-image /restorehealth

HI

1."WSUS here. Therefore I could like to know how to configure WSUS for downloading languages ?"

yes, there is another solution that can accomplish the same task more easily and better (yes, you still have to ask Microsoft for FOD), and set the group policy to get optional features directly from Windows Update.

We apply below domain policy to specified issue computer, enter gpupdate /force in CMD on both DC and client computer, reboot the client then check the result.

Computer Configuration>Policies>Administrative Templates>System>Specify settings for optional component installation and component repair
Set it to Enabled

Alternate source file path: empty
Never try to download payload from Windows Update: Disabled
Download repair content and optional features directly from Windows Update instead of Windows Server Update Services (WSUS): Enabled
like below picture, finally then reboot the computer then check the result.

There are other documents for your reference.

How to make Features on Demand and language packs available when you're using WSUS or Configuration Manager
https://docs.microsoft.com/en-us/windows/deployment/update/fod-and-lang-packs

Problems using a Japanese or Traditional Chinese IME on a non-Japanese or non-Traditional Chinese version of Windows 10 immediately after installing the April 2018 Update.
https://answers.microsoft.com/en-us/windows/forum/windows_10-other_settings/problems-using-a-japanese-or-traditional-chinese/db5a0ddf-2c50-4f0d-a961-58902f40acda

Add languages to Windows images
https://docs.microsoft.com/en-us/windows-hardware/manufacture/desktop/add-language-packs-to-windows

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HI
Is there any ting to help you?