DMDE is already exceptionally generous with its free version, which provides the same quality of recovery as paid editions for up to 4,000 files per operation. If you need more than that, the paid options are remarkably affordable—with a lifetime Standard license costing just $48, less than the cost of taking your drive to a professional recovery service for a diagnostic.
If you were getting an "Invalid Key" error despite having a legitimate license, or if the software was reverting to the Free Edition unexpectedly, here is the fix that worked for me: dmde 380 license key fixed
If you have a valid license, do not use the "Paste" function inside the program interface directly. DMDE is already exceptionally generous with its free
DMDE offers a read-only mode to prevent any accidental writes to the target drive. DMDE offers a read-only mode to prevent any