If macOS Big Sur doesn't automatically install on your partitioned hard drive (if it installs macOS Catalina instead, for example), you can install it from your System Preferences in About this Mac. After you have macOS Catalina installed, you can follow the instructions to download and install macOS Big Sur. Running High Sierra on a 2017 4K iMac. Big Sur has not appeared in my Updates and when I tried from App Store, after clicking it showed “calculating “ for half an hour with only 1% showing. After a while that disappeared and there was no sign of downloading progress ( nothing when hover over.

macOS Big Sur elevates the most advanced desktop operating system in the world to a new level of power and beauty. Experience Mac to the fullest with a refined new design. Enjoy the biggest Safari update ever. Discover new features for Maps and Messages. And get even more transparency around your privacy.

Check compatibility

macOS Big Sur is compatible with these computers:

MacBook introduced in 2015 or later
MacBook Air introduced in 2013 or later
MacBook Pro introduced in late 2013 or later
Mac mini introduced in 2014 or later
iMac introduced in 2014 or later
iMac Pro
Mac Pro introduced in 2013 or later
View the complete list of compatible computers.

If upgrading from macOS Sierra or later, macOS Big Sur requires 35.5GB of available storage to upgrade. If upgrading from an earlier release, macOS Big Sur requires up to 44.5GB of available storage. To upgrade from OS X Mountain Lion, first upgrade to OS X El Capitan, then upgrade to macOS Big Sur.

Make a backup

Before installing any upgrade, it’s a good idea to back up your Mac. Time Machine makes it simple, and other backup methods are also available. Learn how to back up your Mac.

Get connected

It takes time to download and install macOS, so make sure you have a reliable internet connection. If you’re using a Mac notebook computer, plug it into an AC power source.

Download macOS Big Sur

If you're using macOS Mojave or later, get macOS Big Sur via Software Update: choose Apple menu  > System Preferences, then click Software Update.

Or use this link to open the macOS Big Sur page on the App Store: get macOS Big Sur. Then click the Get button or iCloud download icon.

Begin installation

After downloading, the installer will open automatically.

Click Continue and follow the on-screen instructions. You may find it easiest to start installation in the evening so that it can be completed overnight, if needed.

If the installer asks for permission to install a helper tool, enter the administrator name and password that you use to log in to your Mac, then click Add Helper.

Allow the installation to be completed

Please allow the installation to be completed without putting your Mac to sleep or closing its lid. Your Mac may restart, display a progress bar or show a blank screen several times as it installs both macOS and related updates to your Mac firmware.

Mac Catalina Steam Not Working

Stay up to date

After installing macOS Big Sur, you will be notified when updates to macOS Big Sur are available. You can also use Software Update to check for updates: Choose Apple menu  > System Preferences, then click Software Update.

Or get macOS Big Sur automatically

If you're using OS X El Capitan v10.11.5 or later and your App Store preferences or Software Update preferences are set to download new updates when available, macOS Big Sur will download conveniently in the background, making it even easier to upgrade. A notification will inform you when macOS Big Sur is ready to be installed. Click Install to get started, or dismiss the notification to install later. When you're ready to install, just open the file named Install macOS Big Sur from your Applications folder.

Learn more

• If the installer shows a list of apps that are not optimised for your Mac, learn about 32-bit app compatibility, then choose whether to proceed with the installation.
• For the strongest security and latest features, upgrade to macOS Big Sur. If you have hardware or software that isn't compatible with Big Sur, you might be able to install an earlier macOS.
• You can also use macOS Recovery to reinstall the macOS you're using now, upgrade to the latest compatible macOS, or install the macOS that came with your Mac.

In this article, I’ve listed the download links for downloading the macOS Catalina ISO image. macOS Catalina was released in Worldwide Developer Conference (WWDC19). The latest version of this OS is macOS Catalina 10.15.5 (19F101). Apple has released there new OS, macOS Big Sur on WWDC20. If you want to try and test macOS Big Sur, follow how to install macOS Big Sur on VMware or how to install macOS Big Sur on VirtualBox guides.

Apple has announced Apple Podcast, TV, and Music app on macOS Catalina operating system. The Dark Mode, which is another most wanted feature that thousands of Mac users were waiting for, was released in the earlier version of Mac OS “Mojave 10.14”. Now it’s also available in macOS Catalina 10.15. There were many other features that you can read on Apple.com.

If you want to install macOS Catalina using VMDK image, you can Download macOS Catalina VMDK for VMWare & VirtualBox.

Download macOS Catalina ISO Image

Why I Cannot Download Macos Catalina

1. Download macOS Catalina 10.15.5 (19F101)Latest
2. Download macOS Catalina 10.15 (19A4871)Beta

Related: Install macOS Catalina on VMware -Windows

Warning: All the content of this site is copyright protected. If anything from this website is copied somewhere, the website link must be mentioned. Otherwise, the targeted website who copied the content will be reported to corresponding copyright law or at least some search engines like Google, Bing. This ISO image is created only for testing & educational purposes, so the miss-use of the image is not tolerated and it’s not our responsibility.

Related: Install macOS Catalina on VirtualBox -Windows

Conclusion

After reading this piece of information, you should have downloaded macOS Catalina ISO Image. The ISO file which is linked for download in this post is up to date and currently the latest version of macOS Catalina.
If you’ve any suggestions or any topics that you want us to cover in the next article, please let us know in the comment section below this post.