There's a fix tool/hack to run Aperture on Catalina, called Retroactive. https://github.com/cormiertyshawn895/Retroactive https://github.com/cormiertyshawn895/

There's a fix tool/hack to run Aperture on Catalina, called Retroactive. https://github.com/cormiertyshawn895/Retroactive https://github.com/cormiertyshawn895/Retroactive It also works for iTunes and iPhoto. Sadly it won't fix any of the other known Catalina issues, of course! ;)