If you purchased an individual license, the key was sent to the email address used during checkout. How to Activate Your Key To enter your credentials and activate the software: Open CasaXPS. Go to the Help menu in the top toolbar. Select About CasaXPS . Click the Register button.

It can be tempting to search for "free" license keys online, but this is highly discouraged for several reasons:

CasaXPS is a software package designed for processing and analyzing XPS data. It's widely used in the field of surface science, materials science, and chemistry. The software provides a range of tools for tasks such as peak fitting, quantification, and data visualization.