HOW TO INSTALL:

Much like any other Custom Addon, Download the Addon, find the "EasyKey_OMT.py" File, and put it wherever you store custom Addons in Blender,

Once it's in a safe location: While in Blender, go to Edit>Preferences>Addons, And click the 'Install' button in the top right.

Next find the file and click install. You're done!

Remember you can always change the key bind in Edit>Preferences>Keymaps>3D VIEW>3D Global