Hold off Upgrading to MacOs Mojave
Mac users may be seeing prompts to upgrade to the new Mojave operating system, but we are recommend holding off until Apple addresses bugs in the new software. These bugs could cause interruptions such as your ability to print because the printer companies have not yet made changes for compatibility. Over the next few weeks we will install and test Mojave to see if the bugs have been addressed and make a new recommendation.
How to avoid installing the Mojave update:
A prompt will appear in the upper right corner of your screen and offer two options - to Install or Details. Click Details.
When the details window opens telling you more about Mojave, just close the window and you won't be forced to update.
Here's Apple's overview of its new macOS.