Where can I purchase this add-on?
Pro is from back around 2012.
Alot changed during 2017-2019 - so doubt it would work with todays versions, even if you found a Pro.
Gary Mardell, the inital developer of the Whos Online plugin is not updating it any more, since 2012. It is now maintained by Vanilla Staff.
Many plugins don't work. I don't think I know what Wanilla is yet.
How can I contact Vanilla Staff about this add-on? I want this add-on and can pay for it.
You want it, it is free
Whosonline is not an addon/application, it is a plugin, needs to go in the right folder
Whosonline is used here on this forum
This addon not working
nimportant. I installed in a different folder and it works fine. Thank you for your help.