8.1/10 Update Slipstreamer

Load-Module DISM
$wsusoffline_directory = "PATH_TO_WSUSOFFLINE_BASE_DIRECTORY"
$work_base_directory = "PATH_TO_WORK_DIRECTORY"
$scratch_directory = "$($wsusoffline_directory)\temp"
$scratch_image = "$($scratch_directory)\work.wim"
$image_index = 1 # or whatever it is on your WIM file
$cabs = Get-ChildItem -Path "$($wsusoffline_directory)\client" -Recurse -Include *.cab,*.msu -Exclude wsusscn2.cab | Sort-Object LastWriteTime
Write-Host "Mounting Image"
$mounted_image = Mount-WindowsImage -ImagePath $scratch_image -Index $image_index -Path "$($work_base_directory)\mountpoint"
Write-Host "Adding Packages to Image"
$failed_updates = [ordered]@{}
foreach ($cab in $cabs){
    $add_result = Add-WindowsPackage -PackagePath $cab.FullName -Path "$($work_base_directory)\mountpoint" -Verbose -LogPath "$($work_base_directory)\updates.log" -LogLevel WarningsInfo -ScratchDirectory $scratch_directory
    if($? -eq $true){
        ($scratch_image,$cab.FullName) -join " :: " | Out-File -FilePath "$($work_base_directory)\updates-success.log" -Append
    } else {
        if($Error[0].Exception.HResult -eq 0x800f081e){
            ($scratch_image,$cab.FullName) -join " :: " | Out-File -FilePath "$($work_base_directory)\updates-Notapplicable.log" -Append
        } else {
            ($scratch_image,$cab.FullName) -join " :: " | Out-File -FilePath "$($work_base_directory)\updates-failed.log" -Append
            $failed_updates.Add($cab, 1)
        }
    }
}
while ($failed_updates.Count -gt 0) {
    foreach ($cab in $failed_updates.Keys){
        $add_result = Add-WindowsPackage -PackagePath $cab.FullName -Path "$($work_base_directory)\mountpoint" -Verbose -LogPath "$($work_base_directory)\updates.log" -LogLevel WarningsInfo -ScratchDirectory $scratch_directory
        if($? -eq $true){
            ($scratch_image,$cab.FullName) -join " :: " | Out-File -FilePath "$($work_base_directory)\updates-success.log" -Append
            $failed_updates.Remove($cab)
        } else {
            $failed_updates[$cab] += 1
            ($scratch_image,$cab.FullName, "Try #$($failed_updates[$cab])]") -join " :: " | Out-File -FilePath "$($work_base_directory)\updates-failed.log" -Append
            if ($failed_updates[$cab] -ge 5){
                $failed_updates.Remove($cab)
            }
        }
    }
}
Write-Host "Enabling Features"
$features = Get-WindowsOptionalFeature -Path "$($work_base_directory)\mountpoint" -LogPath "$($work_base_directory)\features.log" -ScratchDirectory $scratch_directory -LogLevel WarningsInfo -Verbose
$enable_features = $features | Where-Object {
    $_.FeatureName -in (
        "MicrosoftWindowsPowerShellV2Root", "MicrosoftWindowsPowerShellV2", "NetFx3",
        "NetFx4-AdvSrvs", "TelnetClient", "TFTP"
    ) -and $_.State -notin ([Microsoft.Dism.Commands.FeatureState]::Enabled,
                            [Microsoft.Dism.Commands.FeatureState]::EnablePending,
                            [Microsoft.Dism.Commands.FeatureState]::Superseded)
} | Enable-WindowsOptionalFeature -Path "$($work_base_directory)\mountpoint" -LogPath "$($work_base_directory)\features.log" -ScratchDirectory $scratch_directory -LogLevel WarningsInfo -Verbose
Write-Host "Disabling Features"
$disable_features = $features | Where-Object {
    $_.FeatureName -in (
        "WCF-Services45", "WCF-TCP-PortSharing45", "NetFx4Extended-ASPNET45",
        "Microsoft-Hyper-V-All", "SimpleTCP", "SNMP",
        "IIS-WebServerRole", "IIS-WebServer", "IIS-FTPServer",
        "IIS-FTPSvc", "IIS-FTPExtensibility", "Microsoft-Windows-MobilePC-Client-Premium-Package-net",
        "Microsoft-Windows-MobilePC-LocationProvider-INF", "TelnetServer", "SMB1Protocol"
    ) -and $_.State -notin ([Microsoft.Dism.Commands.FeatureState]::Disabled,
                            [Microsoft.Dism.Commands.FeatureState]::DisablePending,
                            [Microsoft.Dism.Commands.FeatureState]::DisabledWithPayloadRemoved,
                            [Microsoft.Dism.Commands.FeatureState]::Superseded)
} | Disable-WindowsOptionalFeature -Path "$($work_base_directory)\mountpoint" -LogPath "$($work_base_directory)\features.log" -ScratchDirectory $scratch_directory -LogLevel WarningsInfo -Verbose
Write-Host "Disabling Bloatware"
$disable_bloatware = Get-AppxProvisionedPackage -Path "$($work_base_directory)\mountpoint" -LogPath $($work_base_directory)\appx.log" -ScratchDirectory $scratch_directory -LogLevel WarningsInfo -Verbose | Where-Object {
    $_.DisplayName -in (
        "Microsoft.BingFinance", "Microsoft.BingFoodAndDrink", "Microsoft.BingHealthAndFitness",
        "Microsoft.BingMaps", "Microsoft.BingNews", "Microsoft.BingSports",
        "Microsoft.BingTravel", "Microsoft.BingWeather", "Microsoft.SkypeApp",
        "Microsoft.XboxLIVEGames", "Microsoft.ZuneMusic", "Microsoft.ZuneVideo"
    )
} | Remove-AppxProvisionedPackage -path "$($work_base_directory)\mountpoint" -LogPath "$($work_base_directory)\appx.log" -ScratchDirectory $scratch_directory -LogLevel WarningsInfo -Verbose
Write-Host "Injecting Post-Setup executables"
# Copy desired executables (frameworks, runtimes, etc) to (IMAGE)\postsetup and append entries to (image)\Windows\Setup\Scripts\SetupComplete.cmd to run unattended installation
$postsetup_script_file = "$($work_base_directory)\mountpoint\Windows\Setup\Scripts\SetupComplete.cmd"
[System.Collections.ArrayList]$postsetup_script = Get-Content $postsetup_script_file
##Ensure cleanup is done on post-install
Write-Host "Adding Component Store Cleanup"
$component_store_cleanup = (
    "start /wait c:\windows\system32\dism.exe /Online /LogPath:c:\setup.log\cleanup-spsuperseded.log /LogLevel:3 /Cleanup-Image /SPSuperseded",
    "start /wait c:\windows\system32\dism.exe /Online /LogPath:c:\setup.log\cleanup-resetbase.log /LogLevel:3 /Cleanup-Image /StartComponentCleanup /ResetBase",
    "start /wait c:\windows\system32\dism.exe /Online /LogPath:c:\setup.log\cleanup-components.log /LogLevel:3 /Cleanup-Image /StartComponentCleanup"
)
[System.Collections.ArrayList]$postsetup_script = $postsetup_script | Where-Object { $_ -notin $component_store_cleanup }
$component_store_cleanup | ForEach-Object { $postsetup_script.Insert($postsetup_script.IndexOf("md c:\setup.log")+1, $_ ) }
Write-Host "Writing New PostSetup Script"
$postsetup_script | Out-File $postsetup_script_file -Encoding ascii -Verbose
Write-Host "Committing Changes to Image"
$retry_counter = 10
do{
    $retry_counter -= 1
    Dismount-WindowsImage -Path "$($work_base_directory)\mountpoint" -Save
}while($? -eq $false -and $retry_counter -gt 0)