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The developers of Odeon offer a directly on their website.

If you'd like, I can provide a more detailed breakdown comparing the of these tools, or explain how to properly calibrate a microphone for use with REW. Which of these would be most helpful for your project? Features and Specifications - ODEON Room Acoustics Software

: You cannot run calculations on your own imported geometries; they can only be viewed in 3D mode. Measurements are limited to the 1000 Hz frequency band.

To make the most of the software, the following official resources are available for free download:

Developed by academic and public research institutions (including Gustave Eiffel University), I-Simpa is a powerful graphical user interface for modeling atmospheric and room acoustics.

Because it is a premium, high-end professional tool, a fully featured, permanent version of ODEON is never distributed as a free download. Websites claiming to offer "cracked," "free," or "unlocked" full versions of ODEON are highly unsafe, frequently carrying malware, and violating intellectual property laws.