Same problem here as others are reporting, Alex. The following is what I’ve discovered:
Plugin version: 1.1.1
Backend version: 1.3.2
In WP 4.9.8, plugin installs and works fine. If I upgrade WP to 5.0 afterwards, the plugin continues to work fine BUT the settings page does not show options to Unlink and Remove files & database tables.
In a fresh WP 5.0 install, I cannot get the plugin to connect to backend at all; there are no Install or Link buttons available.
BTW, I have not succeeded in determining whether plugin.js is loading.
