The new control script needs to be in the same folder as other control scripts. As a clone it should work with the generic control script found here Foscam Clones, but it doesn't. The Wanscam FR4020A2 Pan/Tilt camera is a Foscam clone very similar to this camera Foscam FI8918W Pan/Tilt Camera.
Model specific wikis Wanscam FR4020A2 Pan/Tilt Camera Wanscam FR4020A2 Outdoor Camera General Wanscam directions