Go to the Main Page of the WP website - the page with the bright green "CLICK HERE TO GET STARTED for FREE with the NEW 2016 CUSTOM CLIENT!!" listing at the top. Click on the "get the new client" link, and go to step #2 of the client install instructions page - where it says "Get Razor".
Also be sure and closely follow the instructions given there. The mistake we most often find players making is to not change the UO Data Directory from Auto-Detect to the actual location where our client is installed (by default C:\UOWP )