Is there a guide as to how to upgrade old MSI installations?

Is there a guide as to how to upgrade old MSI installations? That was so easy that the manual installation process seems super complicated in comparison.

/Rune

Anyone?

Seems like I cannot even rephrase the question to try and get an answer How do I upgrade old MSI installations?.

Maybe Elastic is not meant to be updated ever? If that's the case I would like to know.

/Rune