A cracked version of a disk repair tool is the last thing you want. If the software crashes or glitches while rewriting your drive's magnetization, you could lose your data permanently.
If HDD Regenerator 1.71 isn't working for you, consider these modern (and often free) alternatives: hdd regenerator 171 full name serial number free
Version 1.71 is quite old. It may not properly support modern 4TB+ drives or NVMe SSDs. Using outdated software on new hardware can lead to further disk corruption. How to Properly Use HDD Regenerator A cracked version of a disk repair tool