https://github.com/squarespace/server has been removed so that if you attempt to install the local development environment like so:

npm install -g @squarespace/server

It will fail with this error:

git clone [email protected]:squarespace/server ERROR: Repository not found

Here is the full error in the shell:

npm ERR! git clone [email protected]:squarespace/server Cloning into bare repository '/home/simontech/.npm/_git-remotes/git-github-com-squarespace-server-0ebf03aa'...
npm ERR! git clone [email protected]:squarespace/server ERROR: Repository not found.
npm ERR! git clone [email protected]:squarespace/server fatal: Could not read from remote repository.
npm ERR! git clone [email protected]:squarespace/server 
npm ERR! git clone [email protected]:squarespace/server Please make sure you have the correct access rights
npm ERR! git clone [email protected]:squarespace/server and the repository exists.
npm ERR! addLocal Could not install squarespace/server
npm ERR! Error: ENOENT, stat 'squarespace/server'
npm ERR! If you need help, you may report this log at:
npm ERR!     <http://github.com/isaacs/npm/issues>
npm ERR! or email it to:
npm ERR!     <[email protected]>

npm ERR! System Linux 4.4.0-96-generic
npm ERR! command "/usr/bin/nodejs" "/usr/bin/npm" "install" "-g" "@squarespace/server"
npm ERR! cwd /
npm ERR! node -v v0.10.25
npm ERR! npm -v 1.3.10
npm ERR! path squarespace/server
npm ERR! code ENOENT
npm ERR! errno 34
npm ERR! Error: EACCES, open 'npm-debug.log'
npm ERR!  { [Error: EACCES, open 'npm-debug.log'] errno: 3, code: 'EACCES', path: 'npm-debug.log' }
npm ERR! 
npm ERR! Please try running this command again as root/Administrator.

npm ERR! System Linux 4.4.0-96-generic
npm ERR! command "/usr/bin/nodejs" "/usr/bin/npm" "install" "-g" "@squarespace/server"
npm ERR! cwd /
npm ERR! node -v v0.10.25
npm ERR! npm -v 1.3.10
npm ERR! path npm-debug.log
npm ERR! code EACCES
npm ERR! errno 3
npm ERR! stack Error: EACCES, open 'npm-debug.log'
npm ERR! 
npm ERR! Additional logging details can be found in:
npm ERR!     /npm-debug.log
npm ERR! not ok code 0

 I hope SquareSpace will add it back soon