diff --git a/README.md b/README.md
index 70af36a..5766a34 100644
--- a/README.md
+++ b/README.md
@@ -177,11 +177,13 @@ This script executes **if the network is active/any version of Winget is install
 If **ExitCode** is **1** from `_WAU-mods.ps1` then **Re-run WAU**.
 ## Custom scripts (Mods feature for Apps)
 From version 1.8.0, the Mods feature allows you to run additional scripts when upgrading or installing an app.
-Just put the scripts in question with the **AppID** followed by the `-preinstall`, `-upgrade`, `-install` or `-installed` suffix in the **mods** folder.
+Just put the scripts in question with the **AppID** followed by the `-preinstall`, `-upgrade`, `-install`, `-installed` or `-notinstalled` suffix in the **mods** folder.
 
->- Runs before upgrade/install: `AppID-preinstall.ps1`<br>
->- Runs during upgrade/install (before install check): `AppID-upgrade.ps1`/`AppID-install.ps1`<br>
+>- Runs before upgrade/install: `AppID-preinstall.ps1`
+>- Runs during upgrade/install (before install check): `AppID-upgrade.ps1`/`AppID-install.ps1`
 >- Runs after upgrade/install has been confirmed: `AppID-installed.ps1`
+>- Runs after a failed upgrade/install: `AppID-notinstalled.ps1`
+>- Runs after a failed upgrade/install: `_WAU-notinstalled.ps1` (any individual `AppID-notinstalled.ps1` overrides this global one)
 
 The **-install** mod will be used for upgrades too if **-upgrade** doesn't exist (**WAU** first tries `& $Winget upgrade --id` and if the app isn't detected after that `& $Winget install --id` is tried).<br>
 `AppID-install.ps1` is recommended because it's used in **both** scenarios.
diff --git a/Winget-AutoUpdate/functions/Test-Mods.ps1 b/Winget-AutoUpdate/functions/Test-Mods.ps1
index f46d4da..5153f53 100644
--- a/Winget-AutoUpdate/functions/Test-Mods.ps1
+++ b/Winget-AutoUpdate/functions/Test-Mods.ps1
@@ -8,8 +8,14 @@ function Test-Mods ($app) {
     $ModsUpgrade = $null
     $ModsInstall = $null
     $ModsInstalled = $null
+    $ModsNotInstalled = $null
 
     $Mods = "$WorkingDir\mods"
+
+    if (Test-Path "$Mods\_WAU-notinstalled.ps1") {
+        $ModsNotInstalled = "$Mods\_WAU-notinstalled.ps1"
+    }
+
     if (Test-Path "$Mods\$app-*") {
         if (Test-Path "$Mods\$app-preinstall.ps1") {
             $ModsPreInstall = "$Mods\$app-preinstall.ps1"
@@ -27,8 +33,11 @@ function Test-Mods ($app) {
         if (Test-Path "$Mods\$app-installed.ps1") {
             $ModsInstalled = "$Mods\$app-installed.ps1"
         }
+        if (Test-Path "$Mods\$app-notinstalled.ps1") {
+            $ModsNotInstalled = "$Mods\$app-notinstalled.ps1"
+        }
     }
 
-    return $ModsPreInstall, $ModsOverride, $ModsUpgrade, $ModsInstall, $ModsInstalled
+    return $ModsPreInstall, $ModsOverride, $ModsUpgrade, $ModsInstall, $ModsInstalled, $ModsNotInstalled
 
 }
diff --git a/Winget-AutoUpdate/functions/Update-App.ps1 b/Winget-AutoUpdate/functions/Update-App.ps1
index 86e4236..b74c803 100644
--- a/Winget-AutoUpdate/functions/Update-App.ps1
+++ b/Winget-AutoUpdate/functions/Update-App.ps1
@@ -16,8 +16,8 @@ Function Update-App ($app) {
     $Balise = $($app.Name)
     Start-NotifTask -Title $Title -Message $Message -MessageType $MessageType -Balise $Balise -Button1Action $ReleaseNoteURL -Button1Text $Button1Text
 
-    #Check if mods exist for preinstall/install/upgrade
-    $ModsPreInstall, $ModsOverride, $ModsUpgrade, $ModsInstall, $ModsInstalled = Test-Mods $($app.Id)
+    #Check if mods exist for preinstall/override/upgrade/install/installed/notinstalled
+    $ModsPreInstall, $ModsOverride, $ModsUpgrade, $ModsInstall, $ModsInstalled, $ModsNotInstalled = Test-Mods $($app.Id)
 
     #Winget upgrade
     Write-ToLog "##########   WINGET UPGRADE PROCESS STARTS FOR APPLICATION ID '$($App.Id)'   ##########" "Gray"
@@ -81,10 +81,23 @@ Function Update-App ($app) {
         }
     }
 
-    if ($FailedToUpgrade -eq $false) {
-        if ($ModsInstalled) {
-            Write-ToLog "Modifications for $($app.Id) after upgrade/install are being applied..." "Yellow"
-            & "$ModsInstalled"
+    switch ($FailedToUpgrade)
+    {
+        # Upgrade/install was successful
+        $false
+        {
+            if ($ModsInstalled) {
+                Write-ToLog "Modifications for $($app.Id) after upgrade/install are being applied..." "Yellow"
+                & "$ModsInstalled"
+            }
+        }
+        # Upgrade/install was unsuccessful
+        $true
+        {
+            if ($ModsNotInstalled) {
+                Write-ToLog "Modifications for $($app.Id) after a failed upgrade/install are being applied..." "Yellow"
+                & "$ModsNotInstalled"
+            }
         }
     }
 
diff --git a/Winget-AutoUpdate/mods/README.md b/Winget-AutoUpdate/mods/README.md
index d25361a..ff10a4c 100644
--- a/Winget-AutoUpdate/mods/README.md
+++ b/Winget-AutoUpdate/mods/README.md
@@ -2,22 +2,27 @@
 Custom script should be placed here.  
 A script **Template** `_WAU-mods-template.ps1` is included to get you started.  
 Rename it to `_WAU-mods.ps1` if you want to activate/run it via `Winget-Upgrade.ps1`.
-### Pre/During/Post install/uninstall:
+### AppID Pre/During/Post install/uninstall:
 Custom scripts should be placed here.  
 A script **Template** and **Mods Functions** are included as an **example** to get you started...  
 
 Scripts that are considered:  
-**AppID**`-preinstall.ps1`, `-upgrade.ps1`, `-install.ps1` or `-installed.ps1`.  
+**AppID**`-preinstall.ps1`, `-upgrade.ps1`, `-install.ps1`, `-installed.ps1` or `-notinstalled.ps1`.  
 (`-preuninstall.ps1`, `-uninstall.ps1` or `-uninstalled.ps1` - if used together with [Winget-Install](https://github.com/Romanitho/Winget-Install)).  
 
-> Runs before upgrade/install: `AppID-preinstall.ps1`  
-> Runs during upgrade/install (before install check): `AppID-upgrade.ps1`/`AppID-install.ps1`  
-> Runs after upgrade/install has been confirmed: `AppID-installed.ps1`  
+>- Runs before upgrade/install: `AppID-preinstall.ps1`  
+>- Runs during upgrade/install (before install check): `AppID-upgrade.ps1`/`AppID-install.ps1`  
+>- Runs after upgrade/install has been confirmed: `AppID-installed.ps1`  
+>- Runs after a failed upgrade/install: `AppID-notinstalled.ps1`  
+>- Runs after a failed upgrade/install: `_WAU-notinstalled.ps1` (any individual `AppID-notinstalled.ps1` overrides this global one)
 
 The **-install** mod will be used for upgrades too if **-upgrade** doesn't exist (**WAU** first tries `& $Winget upgrade --id` and if the app isn't detected after that `& $Winget install --id` is tried).  
 
 `AppID-install.ps1` is recommended because it's used in **both** scenarios.
 
+A script **Template** for an all-purpose mod (`_WAU-notinstalled-template.ps1`) is included in which actions can be taken if an upgrade/install fails for any **AppID** (any individual `AppID-notinstalled.ps1` overrides this global one)
+Name it `_WAU-notinstalled.ps1` for activation
+
 ### Winget native parameters:
 Another finess is the **AppID** followed by the `-override` suffix as a **text file** (**.txt**).
 > Example:  
diff --git a/Winget-AutoUpdate/mods/_WAU-notinstalled-template.ps1 b/Winget-AutoUpdate/mods/_WAU-notinstalled-template.ps1
new file mode 100644
index 0000000..207eec5
--- /dev/null
+++ b/Winget-AutoUpdate/mods/_WAU-notinstalled-template.ps1
@@ -0,0 +1,29 @@
+<# An all-purpose mod for doing things
+if an AppID upgrade/install in WAU fails
+Name it:
+"$Mods\_WAU-notinstalled.ps1"
+
+This all-purpose mod will be overridden by any specific:
+"$Mods\AppID-notinstalled.ps1"
+#>
+
+<# FUNCTIONS #>
+. $PSScriptRoot\_Mods-Functions.ps1
+
+<# ARRAYS/VARIABLES #>
+
+
+<# MAIN #>
+if ($($app.Id) -eq "Microsoft.SQLServerManagementStudio") {
+	if ($ConfirmInstall -eq $false) {
+        try {
+		    Write-ToLog "...succesfully done something" "Green"
+		}
+		catch {
+		    Write-ToLog "...failed to do something" "Red"
+		}
+	}
+}
+else {
+	Write-ToLog "...nothing defined for $($app.Id)" "Yellow"
+}