Many organizations may have only a single system to import into SharePoint.  Therefore, such organizations could complete their need for the rename process within a relatively short free-trial period.

A marketing decision was reached to release SharePrep as a limited function demonstration program.

However, this approach permits you to use SharePrep as a diagnostic tool to check the lengths of file and folder names as well as to identify the quantity of names that require renaming.  In short, you can determine whether you need the rename functions of SharePrep before committing to the purchase of a license. 

If you feel that you need all functions available in order to evaluate SharePrep, please contact the vendor via the SharePrep support page. A temporary license can be made available if the situation warrants.