This maybe due to your graphics card not being up to specs. Perspective warp relies heavily on openGL.
I suspect you are right. I downloaded the new version to a newer laptop
and the Perspective Warp is available. This is the part of the system
refering to the OpenGL on the older Windows 7:
Display Bounds: top=0, left=0, bottom=1080, right=1920
OpenGL Drawing: Enabled.
OpenGL Allow Old GPUs: Not Detected.
OpenGL Drawing Mode: Basic
OpenGL Allow Normal Mode: False.
OpenGL Allow Advanced Mode: False.