The moment you realize data is missing, stop using the drive. Every new file saved to that disk increases the risk of overwriting your lost data forever.

Download the software from the official website.

The smartest approach is to download the first to see if your data can be saved. If you find your files but don't want to purchase the full version, pivot to a trusted, completely free alternative like Recuva or PhotoRec . Protecting your computer from malicious software is always more valuable than trying to bypass a license fee.