https://github.com/conradwt/macos-26-tahoe-install-guide

https://github.com/conradwt/macos-26-tahoe-install-guide

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• Host: GitHub
• URL: https://github.com/conradwt/macos-26-tahoe-install-guide
• Owner: conradwt
• Created: 2025-06-21T02:33:56.000Z (12 months ago)
• Default Branch: main
• Last Pushed: 2025-06-21T02:43:39.000Z (12 months ago)
• Last Synced: 2025-06-21T03:34:51.613Z (12 months ago)
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  • Readme: README.md

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README

          
# macOS Tahoe Install Guide

This is a good way to install macOS 26 Tahoe without overwriting your existing macOS version. 

Also, all of the volumes within a container share the available space of the container’s disk.

## Create Volume

 

  - Open Disk Utility app

  - Click View -> Show All Devices

  - In the left sidebar, Select Existing Disk Container

  - Above the Volume, click `+`

  - Enter a Name: `macOS 26`

  - Click `Add`

  

  Note: https://www.youtube.com/watch?v=vk1xK28KkLA

  

## Download Installer

  

  - Option #1

  

    - select System Settings -> General -> Software Update -> Beta Updates -> macOS Tahoe 26 Developer Beta

    - From the Terminal, type the following:

    

      ```zsh

      softwareupdate —list-full-installers

      softwareupdate —fetch-full-installer —full-installer-version 26.0

      ```

    Note: https://www.youtube.com/watch?v=EVeQrk4MyB0 

    

  - Option #2 - If the Option #1 doesn’t work, download the installer from the following location:

  

    - https://mrmacintosh.com/macos-tahoe-full-installer-database-download-directly-from-apple

## macOS Sequoia Setup

  - Disable macOS Tahoe 26 Developer Beta

    - Select System Settings -> General -> Software Update -> Beta Updates -> Off

  - Exclude the volume that you used to install `macOS 26 Tahoe`

    - Select System Settings -> Spotlight -> Search Privacy

    - Click the plus button

    - Choose the `macOS 26` volume, and this should appear within the left sidebar of the Finder

    - Click `Done`

   

    Note:  This process is necessary to prevent Spotlight from indexing files, folders, and other information

           from other volumes.

        

## Install

  - Navigate to the installer within `/Applications` folder.

  - Double click to start the installation process, but select the `macOS 26` volume.

  

    Note:  I didn't copy my settings from macOS Sequoia during the installation process.

## macOS 26 Tahoe Post Install

  - Enable macOS Tahoe 26 Developer Beta

    - Select System Settings -> General -> Software Update -> Beta Updates -> macOS Tahoe 26 Developer Beta

  - Exclude `Macintosh HD` volumes

    - Select System Settings -> Spotlight -> Search Privacy

    - Click the plus button

    - Choose the `Macintosh HD`, and this should appear within the left sidebar of the Finder

    - Click `Done`

   

    Note:  This process is necessary to prevent Spotlight from indexing files, folders, and other information

           from other volumes.

  

## Dual Boot

  

  - https://www.youtube.com/watch?v=xzUPFeat9U4