The only fix is to obtain or remember the licence number to activate the application and the only ones that are able to do that are actually the developers. You should insist on contacting them, because this is the official way you'll be getting a new licence to activate the application on your PC.
- Contact email: support@my-health-software.com
When contacting them, make sure to add "My Blood Pressure Registration INFO" in the subject so they can see it among all the spam.