Since Windows 10 build 1803, RSAT (Remote Server Adminitration Tool) is not available for download. We can get it by installing it from Manage Option Features section. However, in some cases, it can not be done due to GPO permission or Windows Update on prem.
Symptoms:
1. Common line DISM installation caused error: 0x800f0954
2. Error in dism.log in c:\Windows\logs\DISM - DISM Package Manager: PID=4828 TID=6516 Failed while processing command add-capability. - CPackageManagerCLIHandler::ExecuteCmdLine(hr:0x800f0954) 2DISM Package Manager processed the command line but failed. HRESULT=800F0954
Step to resolve or install RSAT without any problem.
1. Run powershell in administrative mode.
2. Run command, Set-ItemProperty "REGISTRY::HKLM\Software\Policies\Microsoft\Windows\WindowsUpdate\AU" UseWUserver -value 0
3. Run command, Get-Service wuauserv | Restart-Service
4. Run command, Get-WindowsCapability -Online -Name RSAT* | Add-WindowsCapability -Online
5. Run command, Set-ItemProperty "REGISTRY::HKLM\Software\Policies\Microsoft\Windows\WindowsUpdate\AU" UseWUserver -value 1
Each command line must not produce any error. If it produces error in some line, do not proceed and check the cause.