Hi,
Since I updated Collapsed Topics to have structures which incorportates Collapsed Weeks, I have decided to discontinue the format in terms of devlopment of new features. However, there will be a 2.3 release version and I will continue to perform bug fixing.
To this end, there are new versions for Moodle 1.9 through to 2.2 on http://moodle.org/plugins/view.php?plugin=format_weekcoll.
Cheers,
Gareth