Working with a trial version of Adobe Captivate 2, I created a series of training video projects related to Sharepoint training. I had purchased the full version, but didn't realize I had not upgraded to it when I worked on these training videos. I completed the training videos and sent them to my customer. Of course, after a few weeks, the videos started displaying an expiration message. My customer had not informed me it was doing this and a few months went by. When they finally called me about this issue, I had already upgraded to Adobe Captivate 3. So I proceeded to open the trial-version projects in v3 and publish them. It asked me if I wanted to overwrite my existing project to upgrade to v3 and I accepted. I assumed this would take care of the expiration problem. It did not. The newly published project was still showing "Project has expired".
After hunting online, I found a solution. In the Preferences, there is a section called Start and End. In this section, there is a checkbox for the expiration of a project. The original project had been in a trial version and the expiration time had been set. When it was imported/upgraded to v3, Captivate automatically set the expiration to the trial expiration date. All I had to do was un-check the box to set the project to not expire.