Save the raw key text into %APPDATA%\Sublime Merge\Local\License.sublime-license
Sublime HQ allows you to download and evaluate Sublime Merge for free. There is currently no enforced time limit for the evaluation period, though the software will occasionally display a prompt reminding you to purchase a license if you use it continuously. This allows you to thoroughly test the Git client on your local repositories before spending any money. Purchasing a Personal or Business License sublime merge license key link
When you buy a license, it belongs to you as an individual. You can use it on any computer, operating system, and account where you are the primary user. sublime merge license key link
Check your inbox for an automated email containing your license text and direct management links. sublime merge license key link