Search for "Modular" or "Bold Geometric" on Font Squirrel. They only host fonts that are 100% free for commercial projects. Their filtering system (Bold > Display > Geometric) yields excellent results.
Stick to the official "HK Modular Nova" if you need a free version, or use Sen / Space Grotesk from Google Fonts for a safe, legal, and professional alternative.
The keyword "hot+free+download" suggests you want a trending font without breaking the budget. However, caution is necessary. Many "free font" websites are riddled with licensing traps or malware.