FindPlasterTemplate.ps1

function Find-PlasterTemplate {
    [CmdletBinding(DefaultParameterSetName='Default')]
    [OutputType("PSCustomObject[]")]
    param(
        [Parameter(HelpMessage="Specifies the Name of the Plaster template to find",
                   ValueFromPipelineByPropertyName=$true,
                   Position=0)]
        [ValidateNotNullOrEmpty()]
        [string[]]
        $Name,

        [Parameter(HelpMessage="Specifies the minimum version of a single Template Version. The MaximumVersion and the RequiredVersion parameters are mutually exclusive; you cannot use both parameters in the same command.",
                   ValueFromPipelineByPropertyName=$true,
                   ParameterSetName='MinimumVersion')]
        [ValidateNotNull()]
        [Version]
        $MinimumVersion,

        [Parameter(HelpMessage="Specifies the maximum version of a single Template Version. The MaximumVersion and the RequiredVersion parameters are mutually exclusive; you cannot use both parameters in the same command.",
                   ValueFromPipelineByPropertyName=$true,
                   ParameterSetName='MaximumVersion')]
        [ValidateNotNull()]
        [Version]
        $MaximumVersion,

        [Parameter(HelpMessage="Specifies the exact version number of the Template to install",
                   ValueFromPipelineByPropertyName=$true,
                   ParameterSetName='RequiredVersion')]
        [ValidateNotNull()]
        [Version]
        $RequiredVersion,

        [Parameter(HelpMessage="Specifies to include all versions of a template in the results. You cannot use the AllVersions parameter with the MinimumVersion, MaximumVersion, or RequiredVersion parameters.",
                   ParameterSetName='RequiredVersion')]
        [switch]
        $AllVersions,

        [Parameter(ValueFromPipelineByPropertyName=$true)]
        [ValidateNotNullOrEmpty()]
        [Uri]
        $Proxy,

        [Parameter(ValueFromPipelineByPropertyName=$true)]
        [PSCredential]
        $ProxyCredential,

        [Parameter(ValueFromPipelineByPropertyName=$true)]
        [PSCredential]
        $Credential
    )

    Process
    {
        Try {
            $Module = Find-Module @PSBoundParameters -Tag PlasterTemplate -ErrorAction SilentlyContinue

            if (!$Module) {
                Throw "No match was found for the specified search criteria and template name '${Name}'. Templates must have the tag 'PlasterTemplate'"
            }

            $Module
        }
        Catch {
            Throw
        }
    }
}

InstallPlasterTemplate.ps1

function Install-PlasterTemplate {
    [CmdletBinding(DefaultParameterSetName='Default',
                   SupportsShouldProcess=$true)]
    param(
        [Parameter(Mandatory=$true,
                   HelpMessage="Specifies the Name of the Plaster template to be installed",
                   ValueFromPipelineByPropertyName=$true,
                   Position=0)]
        [ValidateNotNullOrEmpty()]
        [string]
        $Name,

        [Parameter(HelpMessage="Specifies the minimum version of a single Template Version.",
                   ValueFromPipelineByPropertyName=$true,
                   ParameterSetName='MinimumVersion')]
        [ValidateNotNull()]
        [Version]
        $MinimumVersion,

        [Parameter(HelpMessage="Specifies the maximum version of a single Template Version.",
                   ValueFromPipelineByPropertyName=$true,
                   ParameterSetName='MaximumVersion')]
        [ValidateNotNull()]
        [Version]
        $MaximumVersion,

        [Parameter(HelpMessage="Specifies the exact version number of the Template to install",
                   ValueFromPipelineByPropertyName=$true,
                   ParameterSetName='RequiredVersion')]
        [ValidateNotNull()]
        [Version]
        $RequiredVersion,

        [Parameter(ValueFromPipelineByPropertyName=$true)]
        [ValidateNotNullOrEmpty()]
        [Uri]
        $Proxy,

        [Parameter(ValueFromPipelineByPropertyName=$true)]
        [PSCredential]
        $ProxyCredential,

        [Parameter(ValueFromPipelineByPropertyName=$true)]
        [PSCredential]
        $Credential,

        [Parameter(HelpMessage="Forces the installation of the Template")]
        [switch]
        $Force
    )

    Begin
    {
        $YesToAll = $false
        $NoToAll = $false
    }

    Process
    {
        $PSBoundParameters['Repository'] = 'PSGallery'
        $PSBoundParameters['Tag'] = 'PlasterTemplate'

        $FindParams = $PSBoundParameters
        $Null = $FindParams.Remove('Force')
        $Null = $FindParams.Remove('Confirm')
        $Null = $FindParams.Remove('Whatif')

        Try {
            $TemplatesPath = "$Env:APPDATA\Plaster\Templates"
            $Module = PowerShellGet\Find-Module @PSBoundParameters

            if (! (Test-Path -Path $TemplatesPath)) {
                $Null = New-Item -Path $TemplatesPath -ItemType Directory
            }

            if (!$Module) {
                Throw "No match was found for the specified search criteria and template name '${Name}'. Templates must have the tag 'PlasterTemplate'"
            }
            else {
                $Destination = "$TemplatesPath\$($Module.Name)\$($Module.Version)"
            }
            if ($psCmdlet.ShouldProcess($Name, "Install Plaster template")) {
                if (!(Test-Path -Path $Destination)) {
                    $InstallTemplate = $true
                }
                elseif (!($YesToAll -OR $NoToAll -OR $Force)) {
                    $Message = "$Name already Exists"
                    $Message2 = "Do you want to install anyway?"
                    $InstallTemplate = $psCmdlet.ShouldContinue($Message2, $Message, [ref]$YesToAll, [ref]$NoToAll)
                }

                if ($InstallTemplate -or $YesToAll -or $Force) {
                    $PSBoundParameters["Force"] = $true
                    PowerShellGet\Save-Module -LiteralPath $TemplatesPath @PSBoundParameters
                }

            }
        }
        Catch {
            Throw
        }
    }
}