There is no official Notepad++ distribution using MSI technology. All official distributions are either self-extracting exe files or .zip/.7z
I have seen that there are some people on the net who re-package Notepad++ into an MSI, but they are not officially distributed, and the Notepad++ developers make no guarantee or warrantee that what gets installed from any MSI is actually the official Notepad++ product: the developers have no control over whether the re-packagers have modified Notepad++ in some nefarious or other manner.
Notepad++ developers do not support the unofficial MSI distributions.
Official Download Sites https://notepad-plus-plus.org/downloads/ and any pages on that site https://community.notepad-plus-plus.org/category/1/announcements and the http://download.notepad-plus-plus.org/repository/ links that they reference https://github.com/notepad-plus-plus/notepad-plus-plus/releases/No place else is sanctioned or supported