Growl was last updated 6 years ago and is for 10.7 Lion, 10.8 Mountain Lion and 10.9 Mavericks. I do not even know, if it runs on later versions of macOS. Also, above link you posted is from an npm module used by Joplin to handle the notifications. If the documentation for that module is outdated, I suggest to open a ticket with them, not with Joplin.
Also, I've just set a notification and I received it. I'm not sure what your Mac issues are, but it's not a Joplin problem. Otherwise I would not have received a notification either, but I did. So what does this tell you?
Furthermore it wouldn't say Joplin in the Notifications Center, but terminal-notifier.
It doesn't work for you. It works for me. So what now?
First of all, I suggest you fix your computer problems. Secondly, you can ask for a refund at the AppStore. Thirdly, Joplin is free software. Also: read the disclaimer.
There are several things that could have been done before buying Growl. Apparently you didn't do any research, think it through, read the Growl reviews, or whatever. Asking for a refund from a free SW project is a joke.
You can't even read how to provide sufficient information for a bug report. I really suggest you work on your attitude, otherwise noone is going to help you in this forum. At least I won't.
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