Is something missing from the installation instructions?

The installation instructions say this:

1. Download the Anti-Splog plugin file

2. Unzip the file into a folder on your hard drive

3. Upload the /anti-splog/ folder to the /wp-content/plugins/ folder on your site

Note: If you have an older version of the plugin installed in /mu-plugins/ please delete it.

4. Visit Network Admin -> Plugins and Network Activate it there.

5. Upload blog-suspended.php into the /wp-content/ folder on your site

But there is also a anti-splog.php file and no mention of where it’s suppose to be.

So where is it supposed to go?