Added new enabled() method for the PUM_AssetCache class that checks both is writable and not disabled.
Added option to disable just asset caching. This should help in the case your server is blocking the use of our JS from the /uploads/ folder with a 403 error.
It looks like you came from a site offering a nulled copy. You may not need one: the core plugin is free on WordPress.org — unlimited popups, no time limit, no crippled features.
A modified copy can’t check for security updates, and you have no way to verify what else was changed in it.