Welcome to 4images forum.
Ok, I've renamed the filenames in the the instructions, hope it's less confusing then used to.
The files you need to download are located at the very end of the first post in this topic. I put version number into filenames.
As of the error messages, media_sites.php file does not have 379 lines, so I have no clue what is in your media_sites.php file and where you got it from...
as of copying all files, if you open up the template and icons package, you should find there many files inside folders. i.e.:
templates/default/icons/youtube.gif (this is a media icon for youtube site)
...
templates/default/media/mtv.html (this is a media template for mtv site)
...
you need copy all these files into same folder in your 4images template.
As example, lets say you are using a custom template "blah21"
the path to your template will be:
templates/blah21/
inside your template should have "media" and "icons" folders
so the two files above should be copied into:
templates/blah21/icons/youtube.gif (this is a media icon for youtube site)
...
templates/blah21/media/mtv.html (this is a media template for mtv site)
...