Installing Output-Pro on Linux Arch (Manjaro)

[peaolo]

Hi, I'm trying to install this extension on a Manjaro Linux KDE 5.20.4 (derivated by Arch) with Qt 5.15.2 and Kernel 5.10.2, but I had no luck. Any idea to solve it?
The main issue is due to the lack of dependencies, especially libcanberra-gtk-module and libcanberra-gtk3-module.
Hoping these were useful just for sound (?) I DIDN'T install them, but I managed to install PyQt4 by building "python-pyqt4" AUR package.
When I install OUTPUT-PRO and start up inkscape, it returns this error:
Traceback (most recent call last): File "/home/peaolo/.config/inkscape/extensions/outputpro.py", line 14, in <module> reload(sys) NameError: name 'reload' is not defined

Curiosly the same python file correctly imports the module some lines above.
Could you help me please?