How to update to version 3?

As far as I can tell, the update instructions are:

Upgrading:
Go to the Network Admin -> Settings -> Post Indexer page, click on the Rebuild Index tab and then click the Rebuild Index button to get the post indexer to start indexing your sites existing posts.

I don't have a Post Indexer page under settings. On my WordPress Updates page I can't select it from the WordPress list, and the action button ("Download Update") takes me to the plugin page.

I have no problem downloading it and installing it from the zip, but the instructions say something different. Can someone please clarify?