I have just pushed an update to my desktoppr tool which can change the desktop on macOS. No new features but the installer pkg is now notarized.
- desktoppr 0.2 – Release
- Original post: Managing the Desktop Picture on macOS
And because you need to use a newer Xcode and Swift 5 to notarize the tool, it now requires the Swift 5 Runtime support for command line tools when you install it on versions of macOS older than 10.14.4. (On those older versions, you can also continue to use desktoppr-0.1)