I just installed the latest version of Openfire 5.0.1 and am trying to install the subscription plugin. Unfortunately, when I try to entry to the Subscription Properties, they do not load - receives a blank page.
Thank you, reproduced and reported on github issues
Is it possible somehow without this panel to change the settings of this plugin?
Within the next 30 minutes or so, version 1.4.3 of the Subscription plugin will be available on Ignite Realtime: Openfire subscription Plugin Archive
This version will fix the issue that you reported!