How Can I Get The Software MATLAB Latest Version?

Why not buy it?  Direct sales form.  Well, yeah, it is expensive, but the people who worked hard for years on its development deserve to be paid, don't they?

And it isn't that expensive -- you can get student versions for as little as $100 (see here).

Also possible to download free "trial" versions; depending on your application, this might suit your needs fine.

15 day trial version for Mac OS.

Request 30 day trial of version 7.4.

If you want to go searching for a pirate version, here's the deal:

You won't get any technical support.  If you ask around for help on any online communities about problems you're having, there's a high chance you'll be sniffed out and shunned as a pariah.  Because pirate software is often broken in various ways; it wouldn't install correctly without security codes unless it had those alterations.