Installing Emacs
Emacs is available for Linux, MacOSX and Windows. The Spacemacs Readme suggested ways to install Emacs
Minimum Emacs Version - 26.3
Here is a summary of the Emacs installation process for several operating system.
Emacs is available via the Ubuntu software manager. Check which version is available using apt-cache show emacs
sudo apt-get install emacsUbuntu Personal Package Archives
If the Emacs version you want is not available, add the Personal Package Archive from the Ubuntu Emacs Team.
Try the latest nightly builds of Emacs using the emacs-snapshot package, although be aware that some things may break. You can install emacs and emacs-snapshot packages at the same time, calling emacs or emacs-snapshot to run the respective versions of Emacs.
For a self-contained install, download Emacs 26.3 or later from the Emacs for OSX website.
Alternative, if you use Homebrew, run the following command:
brew cask install emacsDownload Emacs-26.3 from the GNU repository and extract the zip file to %AppData%/local/Programs/emacs.
Alternatively, if you are using the Chocolatey package manager then install Emacs version 26
Add the Emacs directory to the PATH variable in your user account environment variables.
To start Emacs run the command runemacs.exe. You can also pin this to the start menu or task bar.
Access to common Unix tools
Command line tools, such as diff, are used by Emacs. To have these command line tools available in Windows, install Emacs as above but then run emacs from a Unix shell such as GitBash.