FYI. When I modify a script, I remove these blocks and simply type in 'return true;" to satisfy the function.
Try locating where it asks for your licence key. Then find the function that is called.
Then you can easily locate the function and comment out the guts, insert return true; then test again.
90% of scripts "nulled" are not at all nulled.
Nulled = no call backs, no remote files, no remote resources, and no back links.