Centralizes KB path cleanup into common cleanup module

Removes duplicated KB path cleanup logic scattered across multiple locations in the build script and consolidates it into the shared cleanup module.

Adds KBPath parameter to the cleanup function and handles removal of Windows/.NET cumulative update downloads when RemoveUpdates flag is set.

Improves maintainability by eliminating redundant cleanup code and ensures consistent cleanup behavior across different build scenarios including standard builds, VHDX caching, and restore defaults operations.

FFUDevelopment/BuildFFUVM.ps1

@@ -3811,14 +3811,8 @@ function Get-FFUEnvironment {
     }
 
     #Run shared cleanup to avoid duplicated logic
-    Invoke-FFUPostBuildCleanup -RootPath $FFUDevelopmentPath -AppsPath $AppsPath -DriversPath $DriversFolder -FFUCapturePath $FFUCaptureLocation -CaptureISOPath $CaptureISO -DeployISOPath $DeployISO -AppsISOPath $AppsISO -RemoveCaptureISO:$CleanupCaptureISO -RemoveDeployISO:$CleanupDeployISO -RemoveAppsISO:$CleanupAppsISO -RemoveDrivers:$CleanupDrivers -RemoveFFU:$RemoveFFU -RemoveApps:$RemoveApps -RemoveUpdates:$RemoveUpdates
+    Invoke-FFUPostBuildCleanup -RootPath $FFUDevelopmentPath -AppsPath $AppsPath -DriversPath $DriversFolder -FFUCapturePath $FFUCaptureLocation -CaptureISOPath $CaptureISO -DeployISOPath $DeployISO -AppsISOPath $AppsISO -RemoveCaptureISO:$CleanupCaptureISO -RemoveDeployISO:$CleanupDeployISO -RemoveAppsISO:$CleanupAppsISO -RemoveDrivers:$CleanupDrivers -RemoveFFU:$RemoveFFU -RemoveApps:$RemoveApps -RemoveUpdates:$RemoveUpdates -KBPath:$KBPath
 
-    #Clean up $KBPath
-    If (Test-Path -Path $KBPath) {
-        WriteLog "Removing $KBPath"
-        Remove-Item -Path $KBPath -Recurse -Force -ErrorAction SilentlyContinue
-        WriteLog 'Removal complete'
-    }
     # Remove existing Apps.iso
     if (Test-Path -Path $AppsISO) {
         WriteLog "Removing $AppsISO"
@@ -5873,8 +5867,6 @@ try {
                         $cachedVHDXInfo.IncludedUpdates += ([VhdxCacheUpdateItem]::new($includedUpdate.Name))
                     }
                 }
-                WriteLog "Removing $KBPath"
-                Remove-Item -Path $KBPath -Recurse -Force | Out-Null
                 WriteLog 'Clean Up the WinSxS Folder'
                 WriteLog 'This can take 10+ minutes depending on how old the media is and the size of the KB. Please be patient'
                 Dism /Image:$WindowsPartition /Cleanup-Image /StartComponentCleanup /ResetBase | Out-Null
@@ -6193,22 +6185,8 @@ If ($BuildUSBDrive) {
 
 Set-Progress -Percentage 99 -Message "Finalizing and cleaning up..."
 # Delegated post-build cleanup to common module
-Invoke-FFUPostBuildCleanup -RootPath $FFUDevelopmentPath -AppsPath $AppsPath -DriversPath $Driversfolder -FFUCapturePath $FFUCaptureLocation -CaptureISOPath $CaptureISO -DeployISOPath $DeployISO -AppsISOPath $AppsISO -RemoveCaptureISO:$CleanupCaptureISO -RemoveDeployISO:$CleanupDeployISO -RemoveAppsISO:$CleanupAppsISO -RemoveDrivers:$CleanupDrivers -RemoveFFU:$RemoveFFU -RemoveApps:$RemoveApps -RemoveUpdates:$RemoveUpdates
+Invoke-FFUPostBuildCleanup -RootPath $FFUDevelopmentPath -AppsPath $AppsPath -DriversPath $DriversFolder -FFUCapturePath $FFUCaptureLocation -CaptureISOPath $CaptureISO -DeployISOPath $DeployISO -AppsISOPath $AppsISO -RemoveCaptureISO:$CleanupCaptureISO -RemoveDeployISO:$CleanupDeployISO -RemoveAppsISO:$CleanupAppsISO -RemoveDrivers:$CleanupDrivers -RemoveFFU:$RemoveFFU -RemoveApps:$RemoveApps -RemoveUpdates:$RemoveUpdates -KBPath:$KBPath
 
-# Remove KBPath for cached vhdx files
-if ($AllowVHDXCaching) {
-    try {
-        If (Test-Path -Path $KBPath) {
-            WriteLog "Removing $KBPath"
-            Remove-Item -Path $KBPath -Recurse -Force -ErrorAction SilentlyContinue
-            WriteLog 'Removal complete'
-        }
-    }
-    catch {
-        Writelog "Removing $KBPath failed with error $_"
-        throw $_
-    }
-}
 
 # Remove WinGetWin32Apps.json so it is always rebuilt next run
 if (Test-Path -Path $wingetWin32jsonFile -PathType Leaf) {

FFUDevelopment/FFU.Common/FFU.Common.Cleanup.psm1

@@ -9,6 +9,7 @@ function Invoke-FFUPostBuildCleanup {
         [string]$CaptureISOPath,
         [string]$DeployISOPath,
         [string]$AppsISOPath,
+        [string]$KBPath,
         [bool]$RemoveCaptureISO = $false,
         [bool]$RemoveDeployISO = $false,
         [bool]$RemoveAppsISO = $false,
@@ -20,7 +21,7 @@ function Invoke-FFUPostBuildCleanup {
     $originalProgressPreference = $ProgressPreference
     $ProgressPreference = 'SilentlyContinue'
     try {
-        WriteLog "CommonCleanup: Starting cleanup (CaptureISO=$RemoveCaptureISO DeployISO=$RemoveDeployISO AppsISO=$RemoveAppsISO Drivers=$RemoveDrivers FFU=$RemoveFFU Apps=$RemoveApps Updates=$RemoveUpdates)."
+        WriteLog "CommonCleanup: Starting cleanup (CaptureISO=$RemoveCaptureISO DeployISO=$RemoveDeployISO AppsISO=$RemoveAppsISO Drivers=$RemoveDrivers FFU=$RemoveFFU Apps=$RemoveApps Updates=$RemoveUpdates KBPath=$KBPath)."
 
         # Primary ISO paths (new naming/location)
         if ($RemoveCaptureISO -and -not [string]::IsNullOrWhiteSpace($CaptureISOPath) -and (Test-Path -LiteralPath $CaptureISOPath)) {
@@ -94,9 +95,11 @@ function Invoke-FFUPostBuildCleanup {
             }
         }
 
-        if ($RemoveUpdates -and -not [string]::IsNullOrWhiteSpace($AppsPath) -and (Test-Path -LiteralPath $AppsPath)) {
+        if ($RemoveUpdates) {
-            $updateDirs = @('Defender', 'Edge', 'MSRT', 'OneDrive', '.NET', 'CU', 'Microcode')
+            if (-not [string]::IsNullOrWhiteSpace($AppsPath) -and (Test-Path -LiteralPath $AppsPath)) {
-            foreach ($d in $updateDirs) {
+                # Remove per-run app update payloads stored under Apps
+                $appUpdateDirs = @('Defender', 'Edge', 'MSRT', 'OneDrive')
+                foreach ($d in $appUpdateDirs) {
                     $target = Join-Path $AppsPath $d
                     if (Test-Path -LiteralPath $target) {
                         WriteLog "CommonCleanup: Removing update folder $target"
@@ -104,6 +107,12 @@ function Invoke-FFUPostBuildCleanup {
                     }
                 }
             }
+            if (-not [string]::IsNullOrWhiteSpace($KBPath) -and (Test-Path -LiteralPath $KBPath)) {
+                # Remove Windows/.NET CU downloads stored under KB
+                WriteLog "CommonCleanup: Removing downloaded updates in $KBPath"
+                try { Remove-Item -LiteralPath $KBPath -Recurse -Force -ErrorAction Stop } catch { WriteLog "CommonCleanup: Failed removing $KBPath : $($_.Exception.Message)" }
+            }
+        }
 
         WriteLog "CommonCleanup: Completed."
     }

FFUDevelopment/FFUUI.Core/FFUUI.Core.Config.psm1

@@ -870,6 +870,7 @@ function Invoke-RestoreDefaults {
             -CaptureISOPath $captureISOPath `
             -DeployISOPath $deployISOPath `
             -AppsISOPath $appsISOPath `
+            -KBPath (Join-Path $rootPath 'KB') `
             -RemoveCaptureISO:$true `
             -RemoveDeployISO:$true `
             -RemoveAppsISO:$true `