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Xcode is a complete developer toolset for creating apps for Mac, iPhone, iPad, Apple Watch, and Apple TV. Xcode brings user interface design, coding, testing, debugging, and submitting to the App Store into a unified workflow.

I am trying to Update the OS from macOS Catalina 10.15.3 to 10.15.4 on my Macbook Air 2014. Every time I click on Update Now Button for updating the OS, a prompt appears saying 'To Update You must restart your Mac'.

Downloading and updating Xcode

The current release of Xcode is available as a free download from the Mac App Store. The Mac App Store will notify you when an update is available or you can have macOS update automatically as it becomes available.

The latest beta version and previous versions of Xcode can be downloaded from the Downloads page. To download Xcode, simply sign in with your Apple ID.Apple Developer Program membership is not required.

Using Xcode

Get step-by-step guidance on how to use Xcode to build, test, and submit apps to the App Store.

Submitting apps to the App Store using Xcode

Xcode provides an integrated workflow for Apple Developer Program members to prepare and submit apps to the App Store. Use the latest version of Xcode available on the Mac App Store to submit your apps or, when available, the latest Release Candidate from the Downloads page.

Don't submit apps built using beta software, as beta versions of Xcode, Operating Systems, and SDKs are for development and testing only.

Learning about changes to Xcode

To learn about the latest features and capabilities in Xcode, see What’s New in Xcode. For update details in the latest released versions, including each beta release, see the Xcode Release Notes.

Minimum requirements and supported SDKs

Xcode Version	Minimum OS Required	SDK	Architecture	Deployment Targets	Simulator	Swift
Xcode 13 beta	macOS Big Sur 11.3	iOS 15 macOS 12 tvOS 15 watchOS 8 DriverKit 21	x86_64 armv7 armv7s arm64 arm64e	iOS 9-15 iPadOS 13-15 macOS 10.9-12 tvOS 9-15 watchOS 2-8 DriverKit 19-21	iOS 10.3.1-15 tvOS 10.2-15 watchOS 3.2-8	Swift 4 Swift 4.2 Swift 5.5
Xcode 12.5.1	macOS Big Sur 11	iOS 14.5 macOS 11.3 tvOS 14.5 watchOS 7.4 DriverKit 20.4	x86_64 armv7 armv7s arm64 arm64e	iOS 9-14.7 iPadOS 13-14.7 macOS 10.9-11.5 tvOS 9-14.7 watchOS 2-7.6 DriverKit 19-20.4	iOS 10.3.1-14.5 tvOS 10.2-14.5 watchOS 3.2-7.4	Swift 4 Swift 4.2 Swift 5.4
Xcode 12.5	macOS Big Sur 11	iOS 14.5 macOS 11.3 tvOS 14.5 watchOS 7.4 DriverKit 20.4	x86_64 armv7 armv7s arm64 arm64e	iOS 9-14.6 iPadOS 13-14.6 macOS 10.9-11.4 tvOS 9-14.6 watchOS 2-7.5 DriverKit 19-20.4	iOS 10.3.1-14.5 tvOS 10.2-14.5 watchOS 3.2-7.4	Swift 4 Swift 4.2 Swift 5.4
Xcode 12.4	macOS Catalina 10.15.4 (Intel-based Mac) macOS Big Sur 11 (Apple silicon Mac)	iOS 14.4 macOS 11.1 tvOS 14.3 watchOS 7.2 DriverKit 20.2	x86_64 armv7 armv7s arm64 arm64e	iOS 9-14.4 iPadOS 13-14.4 macOS 10.9-11.1 tvOS 9-14.3 watchOS 2-7.2 DriverKit 19-20.2	iOS 10.3.1-14.4 tvOS 10.2-14.3 watchOS 3.2-7.2	Swift 4 Swift 4.2 Swift 5.3
Xcode 12.3	macOS Catalina 10.15.4 (Intel-based Mac) macOS Big Sur 11 (Apple silicon Mac)	iOS 14.3 macOS 11.1 tvOS 14.3 watchOS 7.2 DriverKit 20.2	x86_64 armv7 armv7s arm64 arm64e	iOS 9-14.3 iPadOS 13-14.3 macOS 10.9-11.1 tvOS 9-14.3 watchOS 2-7.2 DriverKit 19-20.2	iOS 10.3.1-14.3 tvOS 10.2-14.3 watchOS 3.2-7.2	Swift 4 Swift 4.2 Swift 5.3
Xcode 12.2	macOS Catalina 10.15.4 (Intel-based Mac) macOS Big Sur 11 (Apple silicon Mac)	iOS 14.2 macOS 11 tvOS 14.2 watchOS 7.1 DriverKit 20	x86_64 armv7 armv7s arm64 arm64e	iOS 9-14.2 iPadOS 13-14.2 macOS 10.9-11 tvOS 9-14.2 watchOS 2-7.1 DriverKit 19-20	iOS 10.3.1-14.2 tvOS 10.2-14.2 watchOS 3.2-7.1	Swift 4 Swift 4.2 Swift 5.3
Xcode 12.1	macOS Catalina 10.15.4 (Intel-based Mac) macOS Big Sur 11 (Apple silicon Mac)	iOS 14.1 macOS 10.15.6 tvOS 14 watchOS 7 DriverKit 19	x86_64 armv7 armv7s arm64 arm64e	iOS 9-14.1 iPadOS 13-14.1 macOS 10.9-11 tvOS 9-14 watchOS 2-7 DriverKit 19	iOS 10.3.1-14.1 tvOS 10.2-14 watchOS 2-7	Swift 4 Swift 4.2 Swift 5.3
Xcode 12	macOS Catalina 10.15.4 (Intel-based Mac)	iOS 14 macOS 10.15.6 tvOS 14 watchOS 7 DriverKit 19	x86_64 armv7 armv7s arm64 arm64e	iOS 9-14 iPadOS 13-14 macOS 10.6-10.15.6 tvOS 9-14 watchOS 2-7 DriverKit 19	iOS 10.3.1-14 tvOS 10.2-14 watchOS 3.2-7	Swift 4 Swift 4.2 Swift 5.3
Xcode 11.7	macOS Catalina 10.15.2	iOS 13.7 macOS 10.15.6 tvOS 13.4 watchOS 6.2 DriverKit 19	x86_64 armv7 armv7s arm64 arm64e	iOS 8-13.7 iPadOS 13-13.7 macOS 10.6-10.15.6 tvOS 9-13.4 watchOS 2-6.2 DriverKit 19	iOS 10.3.1-13.7 tvOS 10.2-13.4 watchOS 3.2-6.2	Swift 4 Swift 4.2 Swift 5.2
Xcode 11.6	macOS Catalina 10.15.2	iOS 13.6 macOS 10.15.6 tvOS 13.4 watchOS 6.2 DriverKit 19	x86_64 armv7 armv7s arm64 arm64e	iOS 8-13.6 iPadOS 13-13.6 macOS 10.6-10.5.6 tvOS 9-13.4 watchOS 2-6.2 DriverKit 19	iOS 10.3.1-13.6 tvOS 10.2-13.4 watchOS 3.2-6.2	Swift 4 Swift 4.2 Swift 5.2
Xcode 11.5	macOS Catalina 10.15.2	iOS 13.5 macOS 10.15.4 tvOS 13.4 watchOS 6.2 DriverKit 19	x86_64 armv7 armv7s arm64 arm64e	iOS 8-13.5 iPadOS 13-13.5 macOS 10.6-10.15.4 tvOS 9-13.4 watchOS 2-6.2 DriverKit 19	iOS 10.3.1-13.5 tvOS 10.2-13.4 watchOS 3.2-6.2	Swift 4 Swift 4.2 Swift 5.2
Xcode 11.4.x	macOS Catalina 10.15.2	iOS 13.4 macOS 10.15.4 tvOS 13.4 watchOS 6.2 DriverKit 19	x86_64 armv7 armv7s arm64 arm64e	iOS 8-13.4.x iPadOS 13-13.4.x macOS 10.6-10.15.4 tvOS 9-13.4 watchOS 2-6.2 DriverKit 19	iOS 10.3.1-13.4.x tvOS 10.2-13.4 watchOS 3.2-6.2	Swift 4 Swift 4.2 Swift 5.2
Xcode 11.3.x	macOS Mojave 10.14.4	iOS 13.3 macOS 10.15.2 tvOS 13.3 watchOS 6.1.1 DriverKit 19	x86_64 armv7 armv7s arm64 arm64e	iOS 8-13.3 iPadOS 13-13.3

Mac Os Update 10.15 Download