It has expired because, to cover the time and effort in writing it, and all the development work going into its successor iChangeRef.NET (coming soon!) I had to start charging for it (ie its is no longer a free addin like iDrive, iNudge, iRename, RunMeOnSave, Task Scheduler Viewer etc (all available from http://www.mcadforums.com) after an initial 15 day trial period.
For all the benefits and time savings it provides, I don't think less than £30 (and only £5 upgrade to iChangeRef.NET (when released) for all registered users) is to much to ask
Regards
MattH