Every time you write new data to the drive (including installing recovery software), you risk overwriting the deleted files.
However, the software requires a paid license key to actually save recovered files. This leads many users to search online for "free license keys," "cracks," or "serial numbers" for version 6.4.2.
: Designed for home and small business users. It includes basic file and drive recovery and allows activation on up to two separate PCs (e.g., a laptop and a desktop). Professional License ($99.95)