What are the limitations of the "Trial Versions"?

 

The Trial Versions will let you use all functions within the software with the exception of saving the toolpaths and performing some Export functions.

The Pro Versions of the Trials also do not allow you to use additional Gadgets.

There are a collection of special "trial version specific" files made available for each program that are setup so you can save the toolpaths from them and verify compatibility with your CNC machine by actually machining the samples.

For Aspire, VCarve Pro/Desktop and Cut2D Pro/Desktop these are found in the Getting Started Tutorials from the Video Tutorial Browser and also found here. 
For more information about these tutorials please use the link for "How do I use tutorials in the Trial Edition?" seen below.

You can also access the Trial Projects from the option Evaluation Files to Machine found on the first screen of the Trial.

Cut3D comes with a set of Trial files that are accessed from the trials start screen.

PhotoVCarve can work with any photo image however restricts the toolpath output by applying a watermark to all images.