It looks like similar (and more) functionality is now built in to Discourse:
So there is less reason to install this plugin anymore in terms of functionality.
That said:
- It looks like the built-in functionality only lets you reset the bump date to the last post’s date, not to an arbitrary post’s date.
- The built-in functionality also lets you reply without bumping, but lacks the ability to, say, prevent someone else’s reply from bumping the thread without deleting their reply.
So maybe some people will still want to use it.
Either way, plugin developers should still find the heavily annotated source code useful, even if what it actually does is now redundant.