When caching, it loads the server very much, if the site is large, then it will take a long time. For some reason, the plugin periodically resets the cache itself, although it is worth it in the settings: time to clear the entire cache is 0

What a good forum you have, you can find everything you need for free, Thanks to the author for the file

Good afternoon. The license is valid until 01.01.1970. The plugin is active, but periodically issues an error, writes it from above, I won't even reproduce it exactly now. You can see it from the admin panel.

And how to activate it? I don't see where the activation is