If you need to change your MAC address in 2024 and beyond, you don't need to risk your security with a 2021 crack. There are several safe and even free ways to achieve this:

Emulating a failed device's MAC to restore network connectivity while waiting for hardware replacement.

Searching for a "full crack" for SMAC 2.7 (Technitium MAC Address Changer) usually leads to risky websites that bundle malware, spyware, or unwanted adware with the download.