By purchasing a legitimate key, you support the developers and ensure you receive updates for future OS compatibility. Conclusion
If you have your order ID but lost the email, you can contact Fairdell’s customer support through their official website to request a resend.
On newer versions of Windows (10/11), the software may need permission to write the registration info to the registry. Try right-clicking the HexCmp icon and selecting "Run as Administrator" before entering the key.
Ensure your key matches the version you have installed. A key for HexCmp 1.x will typically not work for HexCmp 2.x unless you have purchased an upgrade. A Note on "Cracks" and "Keygens"
This is usually due to a typo. Instead of typing the key manually, copy and paste it directly from your email to avoid confusing '0' (zero) with 'O' (letter) or '1' (one) with 'I' (capital i).
Cracked versions often crash during large file comparisons, potentially corrupting your data.
If the software is already registered on an old computer, you can sometimes find the registration name in the Help > About section, though the full key is usually masked for security. Troubleshooting Activation Issues
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