There is no macOS Catalina 10.15 available, Apple removes all previous full installers from the App Store

Catalina Update Mac
  1. With MacOS Catalina no longer taking up the primary “Software Update” screen, you’ll continue to be informed of incoming software updates for Security Updates, Safari Updates, iTunes updates, and any other software releases for the currently running MacOS version.
  2. Oct 29, 2019 The macOS Catalina 10.15.1 update includes updated and additional emoji, support for AirPods Pro, HomeKit Secure Video, HomeKit enabled routers, and new Siri privacy settings, as well as bug fixes and improvements.

If you’ve owned a Mac for a while, you’re well-aware of the fact that updating macOS to the latest version is a pretty straightforward procedure.However, if you’re looking to create a bootable USB drive, a full installer file is necessary, and the update you download from Apple’s servers might not always be the full installer, particularly with Catalina and Mojave (Big Sur does not.

when a revised version is released.

The package you downloaded is not the upgrade installer app but an update for Catalina, you need

to be running a previous version of Catalina before that will install. Put it in the Trash, empty the Trash.

You need to download the full installer app from the link below,

Open Safari and click on the blue text,

Go to Check Compatibility to see if your mac qualifies for macOS Catalina.

If it does go to the Download OS section and click on macOS Catalina 10.15.

This will redirect you to the App Store Catalina download page it should say

Get or Download.

This will download the Install macOS directly to your Applications folder.

Catalina Update Mac

It is about 12.24GBs in size so will take a while, be patient.

Double-click on the installer app to install Catalina this will install a full working version

Catalina Update Mac Download

of Catalina and the version will be the latest/ last ver 10.15.7.

Before upgrading make a full back up of your Mac.

Check that third party apps you use have updates available for the new OS.

Catalina Update For Mac

Check that your printers/ scanners etc have updated drivers and software available for the new OS.

Connect your mac to your router via cable rather than rely on WiFi.

Do not use your mac while it is downloading

and do not use any other devices that share the same internet connection.

Update Macos Catalina 10.15.4

If the App Store says ‘Open’ then it is detecting a previous download of the install app

go to the Applications folder locate Install macOS

Move it to the Trash, empty the Trash.

Restart, click on the link again, the App Store should say ‘Get' or 'Download'.

Catalina Update Mac


As you are considering upgrading to Catalina be warned it does not support 32bit apps.

Your Mac is probably running 32bit apps and these will need to be updated to 64bit apps,

some updates may be free, some may be paid. Use this app to discover which apps you have

are 32bit, then contact the developers of the software to see

if they are providing 64bit updates or alternatives.

Catalina Update Macbook Air

Jul 29, 2021 10:44 AM