Updating to 2.0.20 Question

[googler]

Hello Everyone,
My site is currently in version 2.0.19 with the PHP Security version 1.0.3. I am trying to update my site to 2.0.20. I downloaded the file from the stickied post for 2.0.20. I have not modified any of the files. When I extract the zip file I see on folder named "files b4 changes" inside the "premodded files" folder. Now I do not know which of these folders I am supposed to use to replace my website files. On closer inspection, I noticed the "files b4 changes" had newer files but so does "premodded files" for few of them too. Therefore my question would be which one of these am I supposed to use to get this update.

Any help appreciated.

Googler