macOS Catalina killed support for 32-Bit applications. This includes many (still) popular applications like Aperture and iPhoto, but also a lot of hardware for which no 64-Bit drivers exist. Including scanners. The two applications I mentioned have been saved, but now thanks to the folks at VueScan, so have thousands of scanners after they reverse-engineered the drivers.
Although Apple’s Aperture photo editing software has been pretty much unsupported and dead since 2014, there are still people who still choose to use it. Forcing peoples hands, though, Apple pretty much put the final nail in the coffin with the latest macOS Catalina by refusing to even run it. Catalina also made it no longer possible to use iPhoto app (also discontinued).
The reason for their final demise was that Catalina is now a 100% 64-Bit OS, although those are 32-Bit apps. Now, though, programmer Tyshawn Cormier has pulled out the claw hammer and removed that nail with a new app called Retroactive that lets you use both of these applications under the Catalina operating system.
Earlier in the week, Apple released macOS Catalina. But if you’re using Photoshop or Lightroom CC on your Mac, you may want to put the upgrade on hold. Adobe users have reported numerous problems with Photoshop and Lightroom after upgrading the system. And Adobe itself has confirmed that these two programs still aren’t compatible with the latest macOS.