Altium Designer is a complex ecosystem. Version 16.1 is quite old by modern standards, and using a cracked version disconnects you from the official pipeline:
This is Altium’s free, community-driven version intended for the Maker community. It uses the same underlying engine but focuses on open-source projects. altium-designer-16-1-crack
The most immediate danger of downloading a "crack" or "keygen" for Altium 16.1 is the high probability of bundled malware. Altium Designer is a complex ecosystem
If you are a student or educator, you can often apply for heavily discounted or free Altium licenses through official academic programs. Conclusion altium-designer-16-1-crack