Anyone help me with this i just can not get the multiview GUI ever since changing to the steam version
Are you sure you have the key mapped? Also make sure multiview is actually running. If you can adjust FOV with key presses, then it's not multiview.
Also, the button you need to assign is in MISC and it's called "Triples/Tire". When you assign it only press the one key you want to combine with CTRL + ALT So when you've assigned it right, you'll need to go on track then press CTRL + ALT + [the key you chose] That should bring up the Multiview Gizmo.