Hi,
I'm not sure where you are coming from with this post

I can see there are not new versions for the last months and this calendar seems stacked in the pile of old projects.
Whilst the current version was released several months ago, that does not mean that it is old. The last release is very much alive and is being daily by many websites.
The current release is stable (asides from a couple of specific bugs which can quickly be resolved) so I have not felt the need to push a new version out "just for the sake of it".
I don't know if chris has no time or motivation to work on this calendar.
A quick look over this forum and you will see that I am very active with this project and am continually giving support where required. I hardly think that that is a sign of lack of motivation!
Just a couple of days ago for example I published a revised jQuery version of the public JavaScript file.
I am using the code as a base for a lot of my client work recently. I get a lot of requests to do custom installations based on the calendar so to be honest I don't feel that there is a need to make a paid version.
All that said, I do have a new version in the pipeline that brings sevaral new features and a completey revised JavaScript code. I am also considering including a simple backoffice bookings system to the package but I am still not 100% about this idea as each users booking specifications vary greatly so it will be hard to come up with a comon solution.
What is is specifically that you feel is lacking in this current version of the calendar?