The install errors out after following two basic install commands. This is poor code hygiene on the part of the authors. That's "not ready for primetime" in my book.

  npm ERR! code 1
  npm ERR! path /usr/local/lib/node_modules/@openai/codex/node_modules/@vscode/ripgrep
  npm ERR! command failed
  npm ERR! command sh -c node ./lib/postinstall.js
  npm ERR! /usr/local/lib/node_modules/@openai/codex/node_modules/@vscode/ripgrep/lib/download.js:199
  npm ERR!                     zipFile?.close();
  npm ERR!                             ^
  npm ERR! 
  npm ERR! SyntaxError: Unexpected token '.'

Please tell me you are not running a NodeJS release that hasn't been supported for at least 3 years...

Optional chaining was added in v14 (2020), and it sure looks like that is the issue here.