Saving
Welcome in the TVPaint forum Roxy ! 
The trial of TVP Animation Standard Edition is fully functional during 30 days. You can use it for commercial purpose during this period. After this one you won't be able to save (and export) your work anymore and water marks will appear on the project.
The trial of TVP Animation Professional Edition is not time limited but you can not save (and export) your work and water marked are present on the project. This version allow you to try all the functionnalities of the professional version without any time restriction.
Have fun with TVPaint !
The trial of TVP Animation Standard Edition is fully functional during 30 days. You can use it for commercial purpose during this period. After this one you won't be able to save (and export) your work anymore and water marks will appear on the project.
The trial of TVP Animation Professional Edition is not time limited but you can not save (and export) your work and water marked are present on the project. This version allow you to try all the functionnalities of the professional version without any time restriction.
Have fun with TVPaint !