This plugin hasnt been tested with the latest 3 major releases of WordPress. It may no longer be maintained or supported and may have compatibility issues when used with more recent versions of WordPress.
In the beginning the plugin worked although a bit tricky: the cookie notice didn't always vanish after clicking "accept" or showed up again on the next page. Meanwhile the cookie notice doesn't vanish at all. Thus deinstalled the plugin and looking for a better one.
It's a shame this plugin is no longer being updated, even though as of 5.8.2 it still works perfectly. By far the lightest, no bloatware cookie notification plugin. Free, won't slow down your website, works exactly as it should. Very quick and easy to setup, it's a truly hidden and underrated gem.
Hopefully the author will not abandon it.