Swiss PDB Viewer
Swiss PDB Viewer can be installed from this website:
You will need to extract the entire folder and place it under applications.
If you get the rotolib.aa error then try the following steps
- Right click on the swissPDBviewer program after copying the folder to applications
- Click Open Package Contents
- Drill down to the macOS folder and double click the unix program inside
- Now you can pick the correct pdb file to view