Fairy Tale is an ever expanding mod. This mod has grown substantially since its first release back in February and new things are actually added each and every day. This also means that there are frequent updates.
Updates are organized so that they are published on the Fairy Tale CivFanatics discussion thread first, and then, when the public has had the chance to beta-test it, if you will, it is transferred here to ModDB and stored in the Fairy Tale downloads archive. Every now and then, the Patches get too many for it to be convenient to keep the system of a Full Download plus patches, and at such events, all Patches are packaged together with the previous Full Version to create a new one.
We are now at Full Version 4. Full Version 5 of Fairy Tale is coming within the week, since the number of patches is now too large. This is how Fairy Tale expands.
If you want to help in the development of Fairy Tale, please keep an eye on the CivFanatics discussion thread where all new patches are announced. Comments on new patches are imperative, and there is a lack of such good comments. Therefore, Fairy Tale is really in need of beta-testers in that respect.