Licence types are described here.
For transfer from the existing version (Demo, Lite) to a higher one (Lite, Professional) only acquisition of a relevant license is required, no need to download and install the program. In such a
case all data priory entered in the program will be preserved.
When selling of a license for the Professional-version we presume that the purchaser has priory installed and tested the Demo and/or Lite version in his/her computer(system).