by Rick Jerz.
a) I am not sure about the upgrade path. From your earlier posts, I think you said your current Moodle is 2.0. Maybe someone else will know.
b) Which files? I am not sure what you me?
My video shows a brand new install of the latest version of Moodle, which I think you said you want to leave your old 2.2 alone. Upgrading is similar, but there are a few more steps. Moving your moodle is a little different than a new, or an upgrade.
If you want to take the suggestions "to do a compete new install", my method is one of many that you can follow.
I am not sure how many courses are in your current Moodle?