I think I broke my MacBook

So I tried installing OCLP on my mid 2015 MacBook pro but I keep running into this problem and I am sorry I broke my MacBook and everybody of trouble shotting I do doesn't seem to work so clearly I done something wrong.

I can only book up the MacBook on the usb key that I made to install OCLP. I tried without it and I just get a folder with a question mark on it or a folder with a error symbol on it.

I thankfully backup my MacBook on a portable drive before I did all of this but I can't seem to get it to show up on the bootup screen and when I did finally to get it to show up, I couldn't get it to install. I'm clearly doing something wrong but I'm not sure what exactly.

I was following Mr Macintosh YouTube video but the downloads I used from GitHub was the lastest version and not the one he was using which I think is part of the problem.

Any help is appreciated