Max msp

This program is really fun to play around with and I enjoy it but I just wish I could get it on my computer. I have a PC so that is the first isssue but I know some people in the class got it to work on their laptops. When I look for it online I cannot find the free trial. All the websites I go to has a dollar amount next to the download and it is making me upset. For anyone who has it on their PC can you tell me where did you download from if you remember. Thanks in advance