VPNs require constant updates to stay ahead of new security threats and to maintain server compatibility. A cracked version is stuck in the past (like the 2021 version you mentioned), meaning it likely won't connect to modern servers and will be full of unpatched vulnerabilities.
Instead of risking your security with a crack, you can use these verified methods to access the service: NordVPN for Windows: release notes nordvpn 62670 crack patch for windows full version 2021