diff --git a/apps/FF Multi Converter/install b/apps/FF Multi Converter/install
index adbf8ce543..a780eb9ded 100755
--- a/apps/FF Multi Converter/install	
+++ b/apps/FF Multi Converter/install	
@@ -5,5 +5,13 @@ install_packages python3 python3-pyqt5 python3-distutils ffmpeg imagemagick unoc
 git_clone https://github.com/ilstam/FF-Multi-Converter || exit 1
 
 cd FF-Multi-Converter || error 'Failed to cd into "FF-Multi-Converter" directory!'
-errors="$(sudo python3 setup.py install 2>&1)" || error "Failed to install FF Multi Converter!\nErrors:\n$errors"
+
+case $__os_codename in
+mantic|bookworm)
+  errors="$(sudo python3 setup.py install --old-and-unmanageable 2>&1)" || error "Failed to install FF Multi Converter!\nErrors:\n$errors"
+  ;;
+*)
+  errors="$(sudo python3 setup.py install 2>&1)" || error "Failed to install FF Multi Converter!\nErrors:\n$errors"
+  ;;
+esac
 sudo rm -rf FF-Multi-Converter