Partition tools have direct kernel-level access to your hard drive. A cracked version may contain malicious code that corrupts the partition table on purpose. Instead of merging your C: and D: drives, you could lose everything.

If you downloaded and executed a file from a "license key" website:

If you find malware, consider a full Windows reinstall to be safe.

MiniTool Software frequently partners with tech blogs (e.g., Giveaway Club, SharewareOnSale) to offer genuine one-year license keys for the Pro version. These are not "128" keys, but they work 100% legally.