The download is free. Enter your email address: your activation key is sent to you by email, and the download starts on this page. It has to be a real address, because that is the only way the key is delivered.
The key must be activated within 7 days of when we send it. If you let them pass it no longer works: come back here and we will send you another one right away, free.
The key you receive is Lifetime Premium: it unlocks every feature, forever, without paying anything. That is how it is for everyone, and there is no paid version.
We use your email address only to send you the key and to help you if you lose it: no ads, no mailing lists. You can ask for it to be deleted at supporto@turbofix.it.
Do not worry: it only means the paid code-signing certificate is missing, not that there is anything wrong with the file. It is like walking into a shop that has just opened: Windows asks for confirmation the first time.