How to upgrade from 2.2.4-pl to 2.2.13?

I'm running 2.2.4-pl and would like to upgrade to the current version (2.2.13) on my admin dashboard recommends:

"For releases prior to 2.2.6, please contact MODX Support for assistance patching your version, or to get help with an upgrade to 2.2.13."

What are the exact steps to do this properly?

Thanks,

This is one way to do it: http://bobsguides.com/modx-upgrade-faq.html