Most admin machines running don't have internet access to install these tools online. To install in an environment with no internet access 1st download and install the Windows 10 Features on Demand ISO to copy to that machine. Mount the ISO and for installing the tools I use the most run the following commands in an admin powershell:
Add-WindowsCapability -Online -Name Rsat.ActiveDirectory.DS-LDS.Tools~~~~0.0.1.0 -source "e:\" -limitaccess
Add-WindowsCapability -Online -Name Rsat.GroupPolicy.Management.Tools~~~~0.0.1.0 -source "e:\" -limitaccess
Add-WindowsCapability -Online -Name Rsat.BitLocker.Recovery.Tools~~~~0.0.1.0 -source "e:\" -limitaccess
Add-WindowsCapability -Online -Name Rsat.CertificateServices.Tools~~~~0.0.1.0 -source "e:\" -limitaccess
Add-WindowsCapability -Online -Name Rsat.DHCP.Tools~~~~0.0.1.0 -source "e:\" -limitaccess
Add-WindowsCapability –online –Name Rsat.Dns.Tools~~~~0.0.1.0 -source "e:\" -limitaccess
Add Dial-In Tab into ADUC:
From a DC in System32 copy the following files locally: mprsnap.dll, rasuser.dll and rtrfiltr.dll. Then copy the MUI files from en-US.
From admin command prompt register the DLL's using the following command: regsvr32 filename.dll
Good resource for installing more RSAT tools: Installing RSAT Administration Tools on Windows 10 and 11 | Windows OS Hub (woshub.com)
Add-WindowsCapability -Online -Name Rsat.FileServices.Tools~~~~0.0.1.0
Add-WindowsCapability -Online -Name Rsat.GroupPolicy.Management.Tools~~~~0.0.1.0
Add-WindowsCapability -Online -Name Rsat.IPAM.Client.Tools~~~~0.0.1.0
Add-WindowsCapability -Online -Name Rsat.LLDP.Tools~~~~0.0.1.0
Add-WindowsCapability -Online -Name Rsat.NetworkController.Tools~~~~0.0.1.0
Add-WindowsCapability -Online -Name Rsat.NetworkLoadBalancing.Tools~~~~0.0.1.0
Add-WindowsCapability -Online -Name Rsat.BitLocker.Recovery.Tools~~~~0.0.1.0
Add-WindowsCapability -Online -Name Rsat.CertificateServices.Tools~~~~0.0.1.0
Add-WindowsCapability -Online -Name Rsat.DHCP.Tools~~~~0.0.1.0
Add-WindowsCapability -Online -Name Rsat.FailoverCluster.Management.Tools~~~~0.0.1.0
Add-WindowsCapability -Online -Name Rsat.RemoteAccess.Management.Tools~~~~0.0.1.0
Add-WindowsCapability -Online -Name Rsat.RemoteDesktop.Services.Tools~~~~0.0.1.0
Add-WindowsCapability -Online -Name Rsat.ServerManager.Tools~~~~0.0.1.0
Add-WindowsCapability -Online -Name Rsat.Shielded.VM.Tools~~~~0.0.1.0
Add-WindowsCapability -Online -Name Rsat.StorageMigrationService.Management.Tools~~~~0.0.1.0
Add-WindowsCapability -Online -Name Rsat.StorageReplica.Tools~~~~0.0.1.0
Add-WindowsCapability -Online -Name Rsat.SystemInsights.Management.Tools~~~~0.0.1.0
Add-WindowsCapability -Online -Name Rsat.VolumeActivation.Tools~~~~0.0.1.0
Add-WindowsCapability -Online -Name Rsat.WSUS.Tools~~~~0.0.1.