Installs recent version of Sitecore Install Framework along with required dependencies

Install-SIF.ps1

$SitecoreModuleName = 'SitecoreInstallFramework'
$SitecoreRepositoryUrl = 'https://sitecore.myget.org/F/sc-powershell/api/v2'
$SitecoreRepositoryName = 'SCGallery'

# Install NuGet package repository
Install-PackageProvider "NuGet" -MinimumVersion 2.8 -Force | Out-Null

# Install Sitecore's powershell gallery
$SCGallery = Get-PSRepository $SitecoreRepositoryName -ErrorAction SilentlyContinue
If ($null -eq $SCGallery) {
  Register-PSRepository $sitecoreRepositoryName $SitecoreRepositoryUrl -InstallationPolicy "Trusted" | Out-Null
}

# Install Sitecore Installation Framework
$SIF = Get-Module $SitecoreModuleName -ListAvailable
If ($null -eq $SIF) {
  Install-Module $SitecoreModuleName -Repository $SitecoreRepositoryName -Force | Out-Null
}