When you download Reason, installation and upgrade instructions appropriate for your version are included in the package. To get started, see the file README.TXT after downloading Reason.
If you are evaluating Reason but don't want to install it on a server, you can download the Reason CMS virtual machine. When launched in VirtualBox (or other virtualization software), it will acquire an IP address via DHCP and let you test out Reason CMS from your preferred web browser.
If you need help, you can reach us through the Reason discussion google group.