Your Mac will restart. The installation process usually takes 30 to 60 minutes. during this time. Troubleshooting & Alternative Paths

Open from your Applications folder or System Preferences. Click Select Backup Disk and choose your drive. Turn on Time Machine or click Back Up Now . 3. Understand the 64-Bit App Restriction

macOS Catalina is compatible with the following Macs. Generally, if your Mac is from 2012 or later, it is supported: MacBook (Early 2015 or newer) MacBook Air (Mid 2012 or newer) MacBook Pro (Mid 2012 or newer) Mac mini (Late 2012 or newer) iMac (Late 2012 or newer) iMac Pro (2017) Mac Pro (Late 2013 or newer)

Once you're logged into Catalina, a few steps will help you finalize the transition.

You will need at least 12.5GB to 18.5GB of available storage to download and install the installer. Step 3: Download macOS Catalina 10.15

Select your main drive (usually "Macintosh HD") as the destination. Enter your when prompted.

Before downloading, verify that your Mac model is officially supported by Apple for macOS Catalina: : Early 2015 or newer MacBook Air : Mid 2012 or newer MacBook Pro : Mid 2012 or newer Mac mini : Late 2012 or newer iMac : Late 2012 or newer iMac Pro : 2017 Mac Pro : Late 2013 or newer

Any application marked with a will not run on macOS Catalina.

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If you are looking to perform the update described in the story, here is the technical breakdown of the steps Elias took:

In the sidebar, scroll down to the section and select Applications .

Wait for the backup process to finish completely before moving forward. Step 4: Clean Up Disk Space and Update Current Apps

Secure 64-bit replacement variants or subscriptions before moving forward.

If you want to look into alternatives or run into specific blocks during setup, tell me: What do you have? Do you have critical 32-bit apps you must keep using? How much free storage space is on your drive right now?

if you are using a laptop.