Hi parakeet,
I think it’s about the options.php file. As described in readme first of all and before activate the plugin, you need to copy the file wp-content/plugins/adminrocket/adminrocket-options/options.php to the root of your theme (wp-content/themes/yourtheme). After, connect to WordPress backend and activate AdminRocket. Is it working for you ? I just try again and it’s working for me.
Thanks for your feedback