The free Personal Edition (with limited functionalities) can be downloaded here. You will need to enter a valid email address to receive a personal password, allowing you access to the IBExpert Download Center.
Once you have received your password you can login into the IBExpert Download Center and download the IBExpert Personal Edition.
The Personal Edition includes access to two IBExpert Developer Studio modules, the IBExpert IDE and IBExpertLive, and also includes the IBExpert Demo Database. (Other IBExpert Developer Studio modules will only work on licensed computers.)
Further information regarding the free IBExpert Personal Edition can be found in the IBExpert online documentation.