Latest questions about "smartpcfixer"

I have received via email my licence No., expire date, receipt date , serial No. etc but I don't know what to do next. Can you explain?

I don't use the program often, but when I went to use, it asked to register again. I don't know where my reg key is. How can I recover?

I have previously purchased SmartPCFixer, but accidentally I uninstalled it. How can I reinstall the application? I know my license number.