Module:

PowerShellGet Module

Downloads one or more modules from a repository, and installs them on the local computer.

Install-Module
    [-Name] <String[]>
    [-MinimumVersion <String>]
    [-MaximumVersion <String>]
    [-RequiredVersion <String>]
    [-Repository <String[]>]
    [-Credential <PSCredential>]
    [-Scope <String>]
    [-Proxy <Uri>]
    [-ProxyCredential <PSCredential>]
    [-AllowClobber]
    [-SkipPublisherCheck]
    [-Force]
    [-AllowPrerelease]
    [-AcceptLicense]
    [-PassThru]
    [-WhatIf]
    [-Confirm]
    [<CommonParameters>]

Install-Module
    [-InputObject] <PSObject[]>
    [-Credential <PSCredential>]
    [-Scope <String>]
    [-Proxy <Uri>]
    [-ProxyCredential <PSCredential>]
    [-AllowClobber]
    [-SkipPublisherCheck]
    [-Force]
    [-AcceptLicense]
    [-PassThru]
    [-WhatIf]
    [-Confirm]
    [<CommonParameters>]

The Install-Module cmdlet gets one or more modules that meet specified criteria from an online repository. The cmdlet verifies that search results are valid modules and copies the module folders to the installation location. Installed modules aren't automatically imported after installation. You can filter which module is installed based on the minimum, maximum, and exact versions of specified modules.

If the module being installed has the same name or version, or contains commands in an existing module, warning messages are displayed. After you confirm that you want to install the module and override the warnings, use the -Force and -AllowClobber parameters. Dependent upon your repository settings, you might need to answer a prompt for the module installation to continue.

The parameters that take module version numbers expect strings formatted as version numbers.

• Standard version numbers have a format of x.y.z where x, y, and z are numbers
• Prerelease versions have a format of x.y.z-<prerelease_label> where the <prerelease_label> is arbitrary string assigned to that release.

These examples use the PowerShell Gallery as the only registered repository. Get-PSRepository displays the registered repositories. If you have multiple registered repositories, use the -Repository parameter to specify the repository's name.

This example finds a module in the repository and installs the module.

Find-Module -Name PowerShellGet | Install-Module

The Find-Module uses the Name parameter to specify the PowerShellGet module. By default, the newest version of the module is downloaded from the repository. The object is sent down the pipeline to the Install-Module cmdlet. Install-Module installs the module for all users in $env:ProgramFiles\PowerShell\Modules.

In this example, the newest version of the PowerShellGet module is installed.

Install-Module -Name PowerShellGet

The Install-Module uses the Name parameter to specify the PowerShellGet module. By default, the newest version of the module is downloaded from the repository and installed.

In this example, the minimum version of the PowerShellGet module is installed. The MinimumVersion parameter specifies the lowest version of the module that should be installed. If a newer version of the module is available, that version is downloaded and installed for all users.

Install-Module -Name PowerShellGet -MinimumVersion 2.0.1

The Install-Module uses the Name parameter to specify the PowerShellGet module. The MinimumVersion parameter specifies that version 2.0.1 is downloaded from the repository and installed. Because version 2.0.4 is available, that version is downloaded and installed for all users.

In this example, a specific version of the PowerShellGet module is installed.

Install-Module -Name PowerShellGet -RequiredVersion 2.0.0

The Install-Module uses the Name parameter to specify the PowerShellGet module. The RequiredVersion parameter specifies that version 2.0.0 is downloaded and installed for all users.

This example downloads and installs the newest version of a module, only for the current user.

Install-Module -Name PowerShellGet -Scope CurrentUser

The Install-Module uses the Name parameter to specify the PowerShellGet module. Install-Module downloads and installs the newest version of PowerShellGet into the current user's directory, $HOME\Documents\PowerShell\Modules.

This example shows how to install the latest version of a module when that version is a prerelease version. Installing a prerelease version requires the AllowPrerelease parameter.

Install-Module -Name Microsoft.PowerShell.Crescendo -AllowPrerelease

Using this method you get the latest version available. If the latest version isn't a prerelease, you get the latest stable version of the module.

This example shows how to install a specific prerelease version of a module. The Find-Module cmdlet can be used to find prerelease versions of modules in the PowerShell Gallery.

Prerelease versions have a format of <version_number>-<prerelease_label>.

Find-Module PSReadLine -AllVersions -AllowPrerelease | Select-Object -First 5

Version        Name             Repository       Description
-------        ----             ----------       -----------
2.2.6          PSReadLine       PSGallery        Great command line editing in the PowerS…
2.2.5          PSReadLine       PSGallery        Great command line editing in the PowerS…
2.2.4-beta1    PSReadLine       PSGallery        Great command line editing in the PowerS…
2.2.3          PSReadLine       PSGallery        Great command line editing in the PowerS…
2.2.2          PSReadLine       PSGallery        Great command line editing in the PowerS…

Install-Module -Name PSReadLine -RequiredVersion 2.2.4-beta1 -AllowPrerelease

Use the version shown in the PowerShell Gallery for the value of the RequiredVersion parameter.

This cmdlet supports the common parameters: -Debug, -ErrorAction, -ErrorVariable, -InformationAction, -InformationVariable, -OutBuffer, -OutVariable, -PipelineVariable, -ProgressAction, -Verbose, -WarningAction, and -WarningVariable. For more information, see about_CommonParameters.

Find-Module creates PSRepositoryItemInfo objects that can be sent down the pipeline to Install-Module.

When using the PassThru parameter, Install-Module outputs a PSRepositoryItemInfo object for the module. This is the same information that you get from the Find-Module cmdlet.

PowerShell includes the following aliases for Install-Module:

• All platforms:
  • inmo

Install-Module runs on PowerShell 5.0 or later releases, on Windows 7 or Windows 2008 R2 and later releases of Windows.

As a security best practice, evaluate a module's code before running any cmdlets or functions for the first time. To prevent running modules that contain malicious code, installed modules aren't automatically imported after installation.

If the module name specified by the Name parameter doesn't exist in the repository, Install-Module returns an error.

To install multiple modules, use the Name parameter and specify a comma-separated array of module names. If you specify multiple module names, you can't use MinimumVersion, MaximumVersion, or RequiredVersion. Find-Module creates PSRepositoryItemInfo objects that can be sent down the pipeline to Install-Module. The pipeline is another way to specify multiple modules to install in a single command.

By default, modules for the scope of AllUsers are installed in $env:ProgramFiles\PowerShell\Modules. The default prevents confusion when you install PowerShell Desired State Configuration (DSC) resources.

A module installation fails and can't be imported if it doesn't have a .psm1, .psd1, or .dll of the same name within the folder. Use the Force parameter to install the module.

If an existing module's version matches the name specified by the Name parameter, and the MinimumVersion or RequiredVersion parameter aren't used, Install-Module silently continues but doesn't install the module.

If an existing module's version is greater than the value of the MinimumVersion parameter, or equal to the value of the RequiredVersion parameter, Install-Module silently continues but doesn't install the module.

If the existing module doesn't match the values specified by the MinimumVersion or RequiredVersion parameters, an error occurs in the Install-Module command. For example, if the version of the existing installed module is lower than the MinimumVersion value or not equal to the RequiredVersion value.

Install-Module also installs any dependent modules specified as required by the module publisher. The publisher lists the required modules and their versions in the module manifest.