Download and Install macOS Sequoia 15.1.1 with and without App Store

When you read this, you may have a clear understanding of the new features in macOS Sequoia and can't wait to try it out.

So, how can you download and install macOS Sequoia?

Don't worry; this guide will walk you through the detailed steps to download and install the macOS Sequoia. Let's get started!

Before You Start

1. Check macOS Sequoia 15.1.1 Compatibility

Below is a list of Mac modes compatible with macOS Sequoia.

• iMac: 2019 and later
• iMac Pro: 2017 and later
• Mac Studio: 2022
• MacBook Air: 2020 and later
• Mac Mini: 2018 and later
• MacBook Pro: 2018 and later
• Mac Pro: 2019 and later

2. Clear Enough Storage Space

The macOS Sequoia installer is approximately 15 GB. To ensure a smooth download and installation process, it is best to keep at least 35 GB of free storage space.

To check the available storage space on your Mac, click the Apple menu > System Settings > General > Storage.

If your Mac runs low on storage space, try BuhoCleaner. As the name suggests, BuhoCleaner is a cleaner that is specifically designed to remove unnecessary files from your Mac to keep your Mac clean and optimized.

Here's how to free up space on your Mac using BuhoCleaner:

1. Download, install, and launch BuhoCleaner.
2. Click the Scan button to flash clean your Mac. (The screenshot below shows how much space I cleared out.)

   

3. Move to App Uninstall to uninstall unwanted apps from your Mac. (Google Chrome took up over 5 GB of my storage space.)

   

4. To further clean up your Mac, explore features like Duplicates, Large Files, and Disk Space Analysis.

3. Back Up Your Mac

Whether you're upgrading or downgrading your Mac, it's recommended to create a backup of it first.

The official way to back up your Mac is by using Time Machine, a tool built into macOS. For detailed steps, refer to the related guide below.

Related Article: [Full Guide] How to Back Up a Mac with/without Time Machine

How to Download and Install macOS Sequoia with the App Store

The official way to download and install macOS Sequoia 15.1.1 is to use the App Store.

Here are the steps.

1. Click the Apple menu and select System Settings.
2. Click General > Software Update > Upgrade Now.
3. Follow the on-screen download and install instructions.

How to Download and Install macOS Sequoia without the App Store

If you want to install macOS Sequoia on a separate APFS partition or volume, download macOS Sequoia from an InstallAssistant.pkg file.

Here's how:

1. Click the download link below.

   Download macOS 15.1.1 Full Installer

2. Once the .pkg file is downloaded, open and run it as requested.

   

3. Open Finder > Applications, and you will find an app named Install macOS Sequoia.

4. Double-click the Install macOS Sequoia.app and install it on your desired space.

   

Related Article: [Full Guide] How to Install macOS on an External Drive

The Bottom Line

By following the steps above, you should have successfully installed macOS Sequoia 15.1.1 on your Mac.

macOS Sequoia is still in its early stages. This means you may encounter many unexpected problems.

If you are disappointed with macOS Sequoia 15.1.1 and want to downgrade it to an earlier version, see How to downgrade your macOS.