If you’re already running Artisan POS version 4.9.140 or later, you can Check for Updates Automatically.
To upgrade from an older Artisan version, or for a first-time install, contact Artisan POS Technical Support, or your Authorized Dealer to get a Dropbox link for the appropriate installer, and proceed with this article on Installing Artisan POS 4.X.
Some upgrades may also require additional technical assistance.