file must exist

oml/update.py

@@ -143,7 +143,8 @@ def install(stop=True):
                         shutil.rmtree(module_old)
                     shutil.rmtree(new)
                 else:
-                    os.unlink(module_tar)
+                    if os.path.exists(module_tar):
+                        os.unlink(module_tar)
                     return False
         shutil.copy(os.path.join(settings.updates_path, 'release.json'), os.path.join(settings.config_path, 'release.json'))
         if stop: