Once you have downloaded the software , follow these activation steps:

Unofficial versions do not receive official patches or security updates, leaving you vulnerable to known exploits and bugs.

Are you having trouble activating a legitimate key you've already purchased, or Burp Suite subscription model - PortSwigger

Click the button. This will download a .key file or a text block. 3. Activating the License in Burp Suite

: If you are not ready to commit to a full purchase, PortSwigger offers a Free Trial of the Professional edition, allowing you to test its automated scanning capabilities before buying. 2. The Activation Process: Step-by-Step