As per my knowledge using free version will not cause you any problem if you are creating a report for your personal laptop/desktop. However If you would like to import/export those report it wont work. Free Edition is only for the creating report for your personal use, not for distribution. That's the only restriction in QlikView free version. Remaining you can enjoy all the features, what a personal edition provides. If this doesn't answer your question, please come back with the problem what exactly you are facing.
The free version has all the features fo Licensed version, except that you can't open the files created by others for more that 4 times. This is the only limitation that free version has. Can you explain what you are trying to do?