Where can I download for free an working version and clear instructions how to install? I am no computer expert

Everibody may familiar with torrentz.com...just search for it and download...But i am not encouraging pirated softwares...

Somehow it does sound like you are.

Fixed that for you.

You certainly have my accent down.

Earlier versions of Rybka are free (and still very strong). Or you could download Houdini which is stronger than even the current version of Rybka and is free.