Slitherine

I bought the game via download. I have no box or manual.

How can I tell what version of the game I am running?
How do I get to the editor?
Where can I find a game manual?

The version is in the bottom corner of the main menu screen.

The editor is an add on that you can download for free from the downloads sectiosn for CEAW. The game manual should be part of your installer and if not you can also get that from the CEAW downloads section.