The trial period for AudioLabel 6.0 is most likely expired because the trial version of AudioLabel 5.0 was previously installed. Although the trial period is expired, it's still possible to start the program and test out the new features (curved text, rotation, transparency). Also, any labels created with the trial version can be saved and printed out with the full version.
The best way to get another free 15 day trial period, is to install AudioLabel on a different computer. We also offer a 30 day money back guarantee, so it's possible to purchase the software and return it if it does not suit your needs.
Hope that helps.