Hi Warren,
Here is the link to the download page for ControlPoint >> www.metalogix.com/.../controlpoint
Select the ControlPoint Version for your SharePoint 2013 environment
(the current version is 7.4.2605.1)
Download the installer onto the WFE you wish to install it on and then you can walk through the wizard to install ControlPoint onto your server.
Here is another link for documentation that will assist you in installing ControlPoint >> www.metalogix.com/.../ControlPoint_Advanced_Installation_Guide.pdf
In regards to your second question, if your environment is Production you should schedule downtime while ControlPoint goes through it's deployment stage, this is the second part of the setup wizard. While the ControlPoint solutions deploy an IIS reset will take place.
Kind Regards