Yes and no:
Yes - it did not give any error message.
No - it did not install the folder and file.
I did a new install using the bash auto install script, but for whatever reason the node_helper sub-folder and index.js file were not installed.
Running the git checkout command similarly did not install the sub-folder and file (as the sub-folder and file were not originally installed, it seems logical to me that the git checkout command would not ‘reinstall’ them).
Installed the missing sub-folder and file manually.
Re-started with “pm2 restart mm”.
I guess the pertinent question is why the original install exercise did not include the node_helper sub-folder and index.js file???