diff --git a/AltStore/Managing Apps/AppManager.swift b/AltStore/Managing Apps/AppManager.swift
index e955ff17..7742dcb8 100644
--- a/AltStore/Managing Apps/AppManager.swift	
+++ b/AltStore/Managing Apps/AppManager.swift	
@@ -1044,6 +1044,7 @@ private extension AppManager
             {
                 for appExtension in application.appExtensions
                 {
+                    print("Deleting extension \(appExtension.bundleIdentifier)")
                     try FileManager.default.removeItem(at: appExtension.fileURL)
                 }
                 
@@ -1416,6 +1417,24 @@ private extension AppManager
         let context = AppOperationContext(bundleIdentifier: app.bundleIdentifier, authenticatedContext: group.context)
         context.app = ALTApplication(fileURL: app.fileURL)
         
+        
+        let validateAppExtensionsOperation = RSTAsyncBlockOperation {(op) in
+            
+            //App-Extensions: Ensure DB data and disk state must match
+            let dbAppEx: Set<InstalledExtension> = app.appExtensions
+            let diskAppEx: Set<ALTApplication> = context.app!.appExtensions
+            let diskAppExNames = diskAppEx.map { $0.bundleIdentifier }
+            let dbAppExNames = dbAppEx.map{ $0.bundleIdentifier }
+                
+            let isMatching = Set(dbAppExNames) == Set(diskAppExNames)
+            print("AppManager.refresh: App Extensions in DB and Disk are matching: \(isMatching)")
+            print("AppManager.refresh: dbAppEx: \(dbAppExNames); diskAppEx: \(String(describing: diskAppExNames))")
+            if(!isMatching){
+                completionHandler(.failure(OperationError.invalidParameters))
+            }
+            op.finish()
+        }
+        
         /* Fetch Provisioning Profiles */
         let fetchProvisioningProfilesOperation = FetchProvisioningProfilesOperation(context: context)
         fetchProvisioningProfilesOperation.resultHandler = { (result) in
@@ -1426,6 +1445,8 @@ private extension AppManager
             }
         }
         progress.addChild(fetchProvisioningProfilesOperation.progress, withPendingUnitCount: 60)
+        fetchProvisioningProfilesOperation.addDependency(validateAppExtensionsOperation)
+        
         
         /* Refresh */
         let refreshAppOperation = RefreshAppOperation(context: context)
@@ -1459,7 +1480,7 @@ private extension AppManager
         progress.addChild(refreshAppOperation.progress, withPendingUnitCount: 40)
         refreshAppOperation.addDependency(fetchProvisioningProfilesOperation)
         
-        let operations = [fetchProvisioningProfilesOperation, refreshAppOperation]
+        let operations = [validateAppExtensionsOperation, fetchProvisioningProfilesOperation, refreshAppOperation]
         group.add(operations)
         self.run(operations, context: group.context)
 
diff --git a/AltStore/Operations/InstallAppOperation.swift b/AltStore/Operations/InstallAppOperation.swift
index e7a44c1b..4db5f93e 100644
--- a/AltStore/Operations/InstallAppOperation.swift
+++ b/AltStore/Operations/InstallAppOperation.swift
@@ -112,6 +112,22 @@ final class InstallAppOperation: ResultOperation<InstalledApp>
             }
             
             installedApp.appExtensions = installedExtensions
+
+            // Remove stale "PlugIns" (Extensions) from currently installed App
+            if let installedAppExns = ALTApplication(fileURL: installedApp.fileURL)?.appExtensions {
+                let currentAppExns = Set(installedApp.appExtensions).map{ $0.bundleIdentifier }
+                let staleAppExns = installedAppExns.filter{ !currentAppExns.contains($0.bundleIdentifier) }
+                
+                for staleAppExn in staleAppExns {
+                    do {
+                        try FileManager.default.removeItem(at: staleAppExn.fileURL)
+                        print("InstallAppOperation.appExtensions: removed stale app-extension: \(staleAppExn.fileURL)")
+                    } catch {
+                        print("InstallAppOperation.appExtensions processing error Error: \(error)")
+                    }
+                }
+            }
+            
             
             self.context.beginInstallationHandler?(installedApp)