In each situation, my advice would be the same: update your device.
The author of a recent article on one of my favorite tech blogs, Michael Potuck of 9to5Mac, agrees with this notion. He states, “App and operating system updates typically provide bug fixes, security updates, and introduce new features. While it’s possible that installing an update may cause an issue, it’s also possible that not installing the update could cause problems.”
Potuck goes far beyond giving that great advice; he also gives excellent step-by-step instructions for completing the various types of upgrades and updates available on a Mac, including accessing the App Store in macOS, updating apps downloaded from the web, and dealing with Adobe Flash Player.
Read Potuck’s excellent posts: