To use all professional features you should download the licensed copy from your personal site section. In other cases you may just enter an actual license key into the basic version to remove data recovery limit. You may update, upgrade, restore your licensed copy in the personal section (restore your login).
Free Edition includes all features but single command recovers up to 4000 files from the current panel only. License key removes the limitation.
Professional Edition has additional features and grants extended rights to provide data recovery services: