diff --git a/bauh/core/controller.py b/bauh/core/controller.py
index 074b958f..498d1449 100755
--- a/bauh/core/controller.py
+++ b/bauh/core/controller.py
@@ -3,6 +3,7 @@ from threading import Thread
 from typing import List, Dict
 
 from bauh_api.abstract.controller import ApplicationManager
+from bauh_api.abstract.handler import ProcessHandler
 from bauh_api.abstract.model import Application, ApplicationUpdate
 from bauh_api.util.disk import DiskCacheLoader
 from bauh_api.util.disk import DiskCacheLoaderFactory
@@ -119,9 +120,6 @@ class GenericApplicationManager(ApplicationManager):
 
         return installed
 
-    def can_downgrade(self):
-        return True
-
     def downgrade_app(self, app: Application, root_password: str) -> SystemProcess:
         man = self._get_manager_for(app)
 
@@ -148,11 +146,11 @@ class GenericApplicationManager(ApplicationManager):
         if man:
             return man.uninstall(app, root_password)
 
-    def install(self, app: Application, root_password: str) -> SystemProcess:
+    def install(self, app: Application, root_password: str, handler: ProcessHandler) -> bool:
         man = self._get_manager_for(app)
 
         if man:
-            return man.install(app, root_password)
+            return man.install(app, root_password, handler)
 
     def get_info(self, app: Application):
         man = self._get_manager_for(app)
diff --git a/bauh/view/qt/thread.py b/bauh/view/qt/thread.py
index 898b77c7..e5f11eda 100644
--- a/bauh/view/qt/thread.py
+++ b/bauh/view/qt/thread.py
@@ -4,17 +4,18 @@ from typing import List
 
 import requests
 from PyQt5.QtCore import QThread, pyqtSignal
+from bauh_api.abstract.controller import ApplicationManager
+from bauh_api.abstract.handler import ProcessHandler
 from bauh_api.abstract.model import ApplicationStatus
 from bauh_api.exception import NoInternetException
 from bauh_api.util.cache import Cache
 from bauh_api.util.system import SystemProcess
 
-from bauh_api.abstract.controller import ApplicationManager
 from bauh.view.qt import dialog
 from bauh.view.qt.view_model import ApplicationView
 
 
-class AsyncAction(QThread):
+class AsyncAction(QThread, ProcessHandler):
 
     def notify_subproc_outputs(self, proc: SystemProcess, signal) -> bool:
         """
@@ -26,6 +27,8 @@ class AsyncAction(QThread):
 
         success, already_succeeded = True, False
 
+        proc.subproc.wait()
+
         for output in proc.subproc.stdout:
             line = output.decode().strip()
             if line:
@@ -46,7 +49,8 @@ class AsyncAction(QThread):
                     success = False
                     signal.emit(line)
 
-        return success
+        proc.subproc.communicate()
+        return proc.subproc.returncode is None or proc.subproc.returncode == 0
 
 
 class UpdateSelectedApps(AsyncAction):
@@ -224,8 +228,7 @@ class InstallApp(AsyncAction):
             success = False
 
             try:
-                process = self.manager.install(self.app.model, self.root_password)
-                success = self.notify_subproc_outputs(process, self.signal_output)
+                success = self.manager.install(self.app.model, self.root_password, self)
 
                 if success and self.disk_cache:
                     self.app.model.installed = True
@@ -242,6 +245,13 @@ class InstallApp(AsyncAction):
                 self.signal_finished.emit(self.app if success else None)
                 self.app = None
 
+    def handle(self, proc: SystemProcess) -> bool:
+        return self.notify_subproc_outputs(proc, self.signal_output)
+
+    def notify(self, msg: str):
+        if msg:
+            self.signal_output.emit(msg)
+
 
 class AnimateProgress(QThread):