If you previously purchased a license but lost the email:
Click “Buy Now” on the website. Payment options include credit card, PayPal, and various regional providers. Pricing (as of 2025): Hard Disk Sentinel Registration Key And Name
Legitimate discounts do appear:
You can use your real name, a nickname, or a company name. This name will appear in the About box once the software is registered. If you previously purchased a license but lost