Can you recommend me on a reliable place to download a simple VST file for free, so I can connect my M-Audio keyboard controller and jam with it?
If someone can send me a VST file that can also be great.

Thanks!
Maor

http://music.fullbucket.de/modulair.html

https://www.native-instruments.com/en/products/komplete/bundles/komplete-start/

that should get you started
Remeber to also install the 32bit version to use within jammer as jammr only supports 32bit VSTs within its own host.

Thanks a lot, I downloaded from native instruments and it now works
It wasn't easy though..
So I'll just add for others that after installing Native Access, you need to install the product Kontakt 6 Player, and Kontakt Factory Selection in order to get the sounds.
Thanks again
Cheers
Maor