Get installed .NET Framework version with PowerShell

Get-DotNetFrameworkVersion.ps1

$Versions = @(
    @{ Release = 528040; Version = '4.8 or newer' }
    @{ Release = 461808; Version = '4.7.2' }
    @{ Release = 461308; Version = '4.7.1' }
    @{ Release = 460798; Version = '4.7' }
    @{ Release = 394802; Version = '4.6.2' }
    @{ Release = 394254; Version = '4.6.1' }
    @{ Release = 393295; Version = '4.6' }
    @{ Release = 379893; Version = '4.5.2' }
    @{ Release = 378675; Version = '4.5.1' }
    @{ Release = 378389; Version = '4.5' }
)

$release = Get-ItemPropertyValue -Path 'HKLM:\SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full' -Name 'Release'

foreach ($version in $Versions) {
    if ($release -as [int] -ge $version.Release) {
        Write-Host "Detected .NET Framework $($version.Version)"
        break
    }
}