I run the setup and it tells me I need IIS. What is that, and how do I get it?

Installation & Upgrade

IIS stands for Internet Information Services.

You can install it on your server as follows.

Server Manager - Roles - Add Role - Select "Web Server (IIS)" and process with the installation.

 

Please note that you need to re-map .NET framework to the IIS after that.

See the knowledgebase article:
http://support.myeasyprojects.net/KB/a36/can-i-install-re-install-iis-after-installing-net-framework.aspx