Xcode can’t be installed on “Macintosh HD” because macOS version 10.13.6 or later is required

Question

I am struggling to build app with unity on xcode. In the beginning, I could not build the app on my iPhone from xcode because I got this error

This iPhone 8 (Model A1863, A1905, A1906, A1907) is running iOS 12.1.2 (16C101), which may not be supported by this version of Xcode.

I also tried to install the older version xcode but it did not work since it requires new version as mentioned above.

Then, I attempted to reinstall xcode now and got error

Xcode can’t be installed on “Macintosh HD” because macOS version 10.13.6 or later is required.

I am using version 10.12.6 macOS Sierra and I think that there should be available installation version 10.13.6 on my App Store but 10.13 doesn't show up in my app store updates section. Therefore, I went to Apple official page to upgrade to 10.13 but it said that this update requires macOS version 10.13. I cannot install even version version 10.13.

How can I update my OS and install xcode to solve this issue ?

Answer 1

• find the Xcode version corresponding to your current OS version here https://developer.apple.com/support/xcode/
• download it using your Apple Developer account here https://developer.apple.com/download/

Answer 2

To Install the latest macOs version,

click on apple icon
click on About this Mac,
then click on software update

It will show you latest macOs version available, then you can install latest version of XCode
Install Latest Mac Os Youtube video