Always download software from official or trusted sources to avoid malware. Ensure you have a valid license for Bitsum Optimizers Activator 10 to use its features legally.
Your Activation Key is invalid
There are a couple reasons why this might have happened:
1) you don’t have an activation key and entered a fake one
2) you entered the wrong code
3.) You didn't sign up properly
Please double-check that you have downloaded your activation key according to the instructions in the tutorial video.