Assuming you have purchased a license or have one provided by your employer, here is how to activate it:
If you're new to Sublime Merge, you might be able to use it for free during its evaluation period. The evaluation period typically lasts for 14 days, allowing you to fully test the software before deciding to purchase.
Sublime HQ occasionally runs beta testing programs or gives licenses to open-source contributors. These are always announced on the official blog ( https://www.sublimemerge.com/blog ). Avoid any site claiming to "generate" keys.