As seen in user forums, many issues with Prime keys revolve around "transfer issues for paid licenses" or the app not recognizing the unlock. If you use a cracked APK and it breaks after a system update, you have no support system to fix it.
If you have already downloaded a 62KB Nova Launcher Prime APK file from the internet, do not install it immediately. Follow these verification steps: 1. Scan with VirusTotal nova launcher prime 62kb apk