[neaisha]

do a full backup of your site.

ftp and copy all files that need to be changed. this way, even if you mess up, you have the originals and can easily ftp them back to the server if it doesn't work.

the instructions on page 8 work with 4.1.x so i assume it'd work with your version too. the only thing "wrong" with the code is that there is a link that should be code. i think it says "click here to change your zip code" and instead of seeing the code, you get the actual link. so you will need to get the source of the link. other than that, it's right.

i'm not sure if fast lane checkout is a 4.1.x feature but if it's on 4.0.x, it has to be disabled for this mod to work.

good luck