After I got the 757 this morning, I went ahead to https://live-cockpits.weebly.com/ to get the 757 profiles, thinking it would be as easy as the other planes,but realizing I didn't see the 757 on the list, I took to the readme.txt. Then on forward the only successful model was the PW variant, while the RR could not have its model loaded as shown here.
and tinkering with the PW, it wouldn't budge to load textures as shown This using the Live cockpits profile
Then here using a custom profile I came up with
My Graphics Card is a NVIDIA GTX 750 ti if that helps
This is from the same day as the pictures were taken above.