What "installer"?

I want to install the thunder overlay map and example set, to use with bitwig on windows. I’ve downloaded “Sensel_Morph_Bitwig_WithScripts.pkg” but i have no idea how to install, both the morph user guide and the youtube tutorial, say to just download the .pkg file and djust use the installer. What installer would that be? Am I supposed to just know this? I’m so frustrated I could scream.
I’ve searched everywhere I can think to search – to no avail.
Can anyone help me?

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