According to this page it requires/is compatible with 10.10 and higher so it should be fine with El Capitan.
It's easy to miss that on the site.
Version 5.0.1:
Note: Now requires OS X 10.10 or later.
Note: Version 5 is a paid upgrade from previous versions. Upgrade info can be found here.
You're welcome. For some reason it took me a few minutes of poking around the site to realize it was on that page.