DMDE Editions

You can get the most up-to-date information online: dmde.com/buy.html
DMDE Websites and Description

To unlock data recovery limits and other features of your license, you should activate a copy of the software (see Activation). You can manage your license in your DMDE account (restore your login).

Free Edition includes all basic features but a single recovery operation recovers up to 4000 files in the current panel only (you should first open a subdirectory in the current panel and then recover files in the panel). In paid licenses there is no this restriction, and recovery of nested directories is allowed.

Professional Edition provides additional features:

rights to provide data recovery services
portable use on different computers
one-time activation on client computers (including remote use)
data recovery reports (include logs and file checksums)
read support for E01 disk image files
using logs when copying a disk (resume copying, multiple passes)
customizable I/O handler script
recovery of NTFS alternate data streams
DMA access in DOS (for ATA interface)