Drat- I printed out the GM pamphlet awhile ago, but I don't think I have the files still on me- I'm not sure if I claimed it back then since it's not showing up within my library. I wanted to run one of the old edition for some friends before trying out Core.
Try out this link: https://emanoelmelo.itch.io/cbrpnk
But honestly, it is not a massive change. Version 1.5 mostly conveys some stuff better and adds some quality of life techs like skilled/elite obstacles.