Install Checklist

Download ExtremePOS.zip
Extract the folder
Run Setup.exe
Install any components that are needed as it prompts you
Run ExtremePOS and select install server
Accept all defaults for the SQL install
Select that server instance
Upon being asked by the system if EPOSCore has been installed, select No
Go through the EPOSCore install
Run ExtremePOS
Select yes when the system asks if EPOSCore has been installed.  Select EPOSCore.exe.
Register the software
Install crystal components

Congratulations, you should now have ExtremePOS installed