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If you use macOS on a laptop or desktop machine, this Macintosh/iPhone tech suggests that you think very carefully before 'upgrading' to macOS 10.15, AKA Catalina. This major change to macOS removes support for 32-bit applications.

This is a concern because thousands of Mac users use 32-bit apps every day: printer and scanner drivers, older versions of Office and Photoshop, and many more. TechRepublic lists 232 32-bit apps that Apple machines will no longer run as of Catalina. A lot of long-time Mac users, including yours truly, use the oldest version of Mac OS X that will work with modern web sites and services, such as Dropbox, etc. We work on all of the versions, but each time Apple has come out with a new OS there are some losses of useful features and more restrictions on what users can and cannot do. 

So again: it is often best not to reflexively click on the 'upgrade' notices that lurch out from the upper right corner of the screen....