Installing module to blender's python (Mac) I'm trying to install modules (one of them is open3d) with pip command.
From 2.8+ it should be easy as pip install open3d (mentioned here or here), but ...
cd /.../Blender\ 92.app/Contents/Resources/2.92/python/bin
python3.7m -m pip install open3d

results with Terminal report
zsh: command not found: python3.7m

The last one thread I found was a notification - pip is installed from 2.8+ for Win, but not for Linux/Mac builds. So I wanted to install pip with ensurepip as mentioned here ... into Blender's bin folder (where python3.7 file is stored) with command ...
python3.7m -m ensurepip

... but it fails with the same report
zsh: command not found: python3.7m
For some reason using cd to blender's python bin folder and then executed command was not working, but ... path to blender's bin folder with python3.7m + command executed at once worked just fine.

Do I have a &quot;pip&quot;?
I don't know if 2.80 was distributed without a pip (as mentioned above), but 2.79 and also 2.83 Mac build containes a pip ... executing ensurepip was satisfied. You can check that by right click on Blender.app icon &gt; Show Package Contents &gt; Contents &gt; Resources &gt; 2.9x &gt; python &gt; bin, drag&amp;drop bin folder into Terminal window, type python3.7m -m ensurepip and execute. In my case it looked like ...
/Users/Filip/Downloads/Blender\ 92.app/Contents/Resources/2.92/python/bin/python3.7m -m ensurepip

Upgrade &quot;pip&quot;
Terminal recommend update pip to latest version. So copy&amp;paste directory of bin folder or drag&amp;drop bin folder again  into Terminal window, type  python3.7m -m pip install --upgrade pip and execute. My example ...
/Users/Filip/Downloads/Blender\ 92.app/Contents/Resources/2.92/python/bin/python3.7m -m pip install --upgrade pip

Module installation
From what I tried, even without pip care I could just install module by command
python3.7m -m pip install + type your module name. In my case open3d module...
/Users/filip/Downloads/Blender\ 92.app/Contents/Resources/2.92/python/bin/python3.7m -m pip install open3d