Fastest way to install modules on disconnected servers is [[202210111009 Powershell install modules offline|Install powershell modules]].

A better way is to create an offline repo and use it to install the modules.

There are two types of offline repos:

1. nuget based
2. fileshare based

This will details steps for file share based offline repo.

Install powershellget

1. Save OfflinePowerShellGetDeploy

# Save OfflinePowerShellGetDeploy to system which has internet access

Save-Module -Name OfflinePowerShellGetDeploy -Path C:\Users\845874\Downloads\PowerShellGet
Import-Module C:\Users\845874\Downloads\PowerShellGet\OfflinePowerShellGetDeploy


Save-PowerShellGetForOffline -LocalFolder 'C:\Users\845874\Downloads\PowerShellGet\OfflinePowerShellGet'

2. Copy this folder to the disconnected system.
3. Install OfflinePowerShellGetDeploy

Import-Module .\OfflinePowerShellGetDeploy

# Register a file share on my local machine 

$registerPSRepositorySplat = @{ 
	Name = 'LocalPSRepo' 
	SourceLocation = '\\localhost\PSRepoLocal\' 
	ScriptSourceLocation = '\\localhost\PSRepoLocal\' 
	InstallationPolicy = 'Trusted' 
}

Register-PSRepository @registerPSRepositorySplat

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references:

Working with local PSRepositories - PowerShell | Microsoft Learn