Broken Link-GMAX/CFS3 SDK

The link on the aircraft development menu, under the G-max heading, for the CFS3 sdk, keeps bringing up "page not found messages. 

Flight Simulator and other chat
https://forums.simviation.com/phpBB3/
https://forums.simviation.com/phpBB3/viewtopic.php?f=46&t=158620