Ensure your key matches the version number of the software (e.g., a v1.9 key may not work on v1.0).
Understanding "AskAdmin": How to Manage and Secure Your Product Key askadmin product key
If you’ve entered your key and it isn't working, check the following: Ensure your key matches the version number of
Upgrading to the Pro version allows for more advanced features, such as password protection for the UI, blocking the Task Manager, and exporting/importing block lists. Here is everything you need to know about managing, activating, and securing your AskAdmin license. Why You Need a Valid Product Key blocking the Task Manager
The ability to block hundreds of applications at once without performance lag. How to Activate AskAdmin