What I did: turned on my old Mac mini 2014 Yosemite
What happened: cannot load agenda
What I expected:
Things that might be helpful to know (Agenda version, OS and model, etc):
I work in a windows environment for work on desktop and with iOS devices traveling. I want to use Agenda so powered up my OLD MAC MINI. can’t get Agenda to load on this old os. (Yosemite). I may be able to upgrade to Monterey. Can I get Agenda running on Mac OS Yosemite or if I can upgrade to Monterey, will it run on that is? #desperate for windows version or able to run older Mac OS😉
Agenda requires macOS 10.14, which is Mojave. I’m afraid Yosemite is way too old. It is from 2014, and Agenda was only released for the first time in 2018 
Sorry I haven’t got better news. See if you can update to 10.14.
2014 Mac OS does not support MAC Mini. So disappointing. Agenda is exactly what I have been looking for years. I am trying to use Notes and Calendar/Reminders but not the seamless experience I am looking for.
I wish you could follow the Noteplan Path of Web version.
Keep up the good work. Maybe one day I will be a paying advanced user of Agenda.
OK, sorry about that. If you get a new Mac some day, look us up!