staffelprise graduated prices install help

[cdamianou 0]

I have found this contribution which will do what i need for my site, however i have a few problems with the install.

 

I follow the instructions to add certain lines in the relevent php files, however the problem is, the files i need to install which are in the folders labeled Admin and Catalog.

 

I pressume you have to add them in the relevent folders on the server, however this will overwright the original ones. If i do this, the some other contributions i installed and edited these files, then they will not work.

 

Can someone help, in installing this contribution.

 

Thanks