Microsoft has done away with installer from package or otherwise it is now done through dism.
There is a PowerShell command that you could use to add RSAT tools to your system.
Right click on your start menu open PowerShell as administrator
To list all the available RSAT tools use the following command
Get-WindowsCapability -Name "*RSAT*" -Online
Say you want to list out the two tools for Active Directory DS LS tools and the group policy manager tools to give you the install state.
"Rsat.ActiveDirectory.DS-LDS.Tools*","Rsat.GroupPolicy.Management.Tools*" | ForEach-Object {Get-WindowsCapability -name $PSItem -Online}
Changing the command just slightly you can add a particular windows capability in this case we’ll add the two above mentioned applications in RSAT.
The application will be retrieved from Microsoft servers and installed on your local system. Please note that if you’re having connection issues to get to Microsoft servers you may need to disconnect from the corporate network. I have had issues in the past were we are unable to hit the Microsoft servers do to ACL’s applied at the network layer.
"Rsat.ActiveDirectory.DS-LDS.Tools*","Rsat.GroupPolicy.Management.Tools*" | ForEach-Object {Add-WindowsCapability -name $PSItem -Online}
Once completed the install will give a status and if you need to restart the system.
