can't get the arm bones, fk, to work. I read the previous question answers and followed the steps with the new 3.0 file but sitll can't use the arm bones

I followed the link guide, linked the rivet file from collection, and did the f3 library override then ran the 2.8 python script, that came with the course files, from the text editor but i still can't move the arm. I read all the answers from the previous question on this issue but did not have any luck.

edit: i downloaded the new bot file, 3.0, that wayne provided in the dropbox link in the previous question answer thread.