For me the important part is that the system report what is currently installed. That way, months later I can still see what is on my system even if (highly likely) that I have forgotten.
Oh btw, the Monthly Adjust plugin is working on my system even though it still says I need to install “Note: In order for this plugin to actually work, The apscheduler Python module must be installed.”
I did this and waited for 1st August (+10%) to come around and, yay, it did, BUT it still says that I need to install it to make it work.