Some users suggest using a "trial resetter" or blocking DMDE in your firewall to extend the free trial indefinitely. While technically possible for a short time, this is a cat-and-mouse game. Eventually, the software will detect tampering and either crash or watermark your recovered files.
DMDE offers a genuinely useful free edition. Before hunting for an activation key, download the official version from the developer's website. The free edition allows you to: dmde activation key
Contact the developer via the email you used to purchase. They are very responsive and will resend your key. Always keep the original email in a folder called "Software Licenses." Some users suggest using a "trial resetter" or