No, Canoco 4.5 is not available for Mac.
Download Canoco 4.5 software
Yes, you can download Canoco 4.5 software for Windows.
You can't download a trial version of the Canoco software, because it's using the Commercial license. This means you will have to order it in the first place, and then download receive a CD with the software or download it securely from an email that will be sent to you.
Access the following page to obtain the details regarding the order process and installation.
Most complete math calculator for most math/science needs.
A data analysis and statistics add-in for MS Excel.
This software implements divisive classification method named TWINSPAN.