The way it works is - install Xiphos from the repositories using
Synaptic. During the install it asks you something like, "do you want
to install Bibles, etc. now" and when you say OK it presents you with
a window with the available sources. Agree to that and it eventually
brings up a list of books in several categories. One of them, as I
recall it, is "Daily Devotionals" or similar and when expanded (click
on the little right pointing arrow and when it points down you see the
books). Spurgeon's Morning and Evening is called (rather cryptically!)
"SME". You can select as many items as you want and when you click on
OK (or similar) at the bottom they are installed.

You can always add or subtract using the Module Manager, which is
found on the Edit menu. This is how I got "SME" and it seems fully
functional and complete.