You can request a 30-day trial key on the Macrium Free Trial page to test full features before buying.

Macrium Reflect offers a completely free edition for home and business use. While it lacks some advanced features (like incremental backups, viBoot, and rapid delta restore), it still provides:

If you lost your key, you can retrieve it by logging into your Macrium Account with the email address used at purchase. Key Differences in Licensing Models Reflect 8 End of Life - What you need to know! - Macrium

However, I can offer a about legitimate ways to obtain and manage Macrium Reflect 8, along with why purchasing a license is worth it.