Is there a guideline or tool that can help identify how an executable was installed?

I have installed Vim 7.3 long ago (seems called MacVim), and I'd like to upgrade it to 8.0+.

I've tried to list installed packages in some management systems:

port installed (for MacPorts)
brew list (for Homebrew)
pkgutil --packages (for Installer)

but can't find Vim in any of them.

What should I try further? (Or better a guideline to go through all the popular installation methods/systems)

(For this moment, I may need to uninstall this installation, and use Homebrew to install Vim 8.1 so that I can verify some problems mentioned in somebody's post.)

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