It’s a bit hidden due to formatting issues, but the 3PBL_ETQ.pdb file is made in step 4.2, where you `cat` the cleaned 3PBL_A.pdb file with the ETQ.pdb file made in the molfile_to_params step. — Were you able to get to this step, or was there a problem with an earlier step?
If you have the 3PBL_ETQ.pdb file, but it’s not being found correctly, you can edit the `options` file, and give a full path to the file in the line with `-s`.