On September 25, 2017 Apple released macOS High Sierra (Mac OS 10.13).
The biggest change in this version of macOS is a complete and drastic revamp of the underlying file system on certain models. Because this change touches every single aspect of the Macintosh’s operation, it is vital that a complete and restorable backup be done before an upgrade is attempted.
PaperCut works fine on High Sierra but after upgrading, you may see an alert that Java needs to be installed. The dialog box that pops up is misleading as clicking OK seems like the thing to do but you have to click “More Info…” to get to the actual download.
Installing applications. Gatekeeper is the system-wide setting that prevents non-approved apps from being installed on your Mac. In version of macOS prior to 10.12, you could change the default setting of Gatekeeper to allow any app from anywhere to run. Now, you only have two options for the default, Mac App Store downloaded apps and Apple-approved apps. Things like our printer installers will likely not run automatically. One workaround is to use a right-click on an app and choose “Open” from the menu that appears, which will then allow you to open the file despite the warning.
Adobe Illustrator – From Adobe’s web site: “2017 releases of Illustrator CC (and earlier) were not designed, nor supported to run on macOS 10.13 (High Sierra).”