Hi all, thanks to the help of robsprinkhuizen, we were able to track down the cause of the Aered crash that seems to happen on certain Macs with High Sierra or later.
Here is a version that fixes the issue:
http://aerodrums.com/download/Aered-no- ... g-2019.dmg
For now, anti-aliasing is disabled which means that the notation won't be rendered crisp and smooth as before but exported PDFs won't be affected by this. If the original version (https://aerodrums.com/get-aered/) still works for you then you should not install this update.