Make Final Preparations

Now that you know which basic installation technique you’re going to use, you’re nearly ready to proceed. Your next major step (which could take hours, or even longer) is to obtain the Catalina installer; then I’ll recommend a few other quick, last-minute tasks before you dive in.

Turn Off Anti-Malware Software

In general, anti-malware software doesn’t interfere with purchases and upgrades from the App Store. However, when Apple released Mountain Lion, users reported that the Ad Banner Filter in Intego’s VirusBarrier software sometimes interfered with the process of downloading the installer. ...

Get Take Control of Upgrading to Catalina now with the O’Reilly learning platform.

O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.