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This plugin appears to violate guideline #5 on WordPress
Plugins may not contain functionality that is restricted or locked, only to be made available by payment or upgrade.
The Pro features are coded on the page but restricted unless you pay for the plugin. If you want to sell a pro version, more power to you, just don’t junk up the page with non-functional code and an advertisement to upgrade.
Don’t get me wrong, it is a good plugin if you just need to add some JS or CSS site-wide.