Yes!
There are trials for both the Add-on and the Web & iCal module.
Please head over to Getting Started and click the Download button.
The trial version lets you use all the features of soSIMPLE Calendar Add-on, including integrating it into your own workflow. While you’re in trial mode, you’ll have a big “UNREGISTERED” sign on the calendar, and you’ll be prompted every so often to let us know how it’s going.
The Web & iCal Module is included in the download. See our installation article to get started with this powerful module.
Once you purchase soSIMPLE Calendar Add-on and enter your license key into the Settings layout, clicking “Update” will load new software without the annoying messages.