We are slowly getting rid of our old .EXE installs in favour of a simple ZIP file.
To install, you simply drag the main folder inside the ZIP into your MSFS Community folder, That's it!
Don't know where your MSFS Community folder is?
Here is some info to help you:
MSFS2020:
Start MSFS2020
Go to Options → General Options.
Turn on dev mode by clicking the Developers tab and set Developer Mode to On. Now a new menu bar shows up on the top of the screen.
In this menu, click Tools → Virtual File System.
Expand "Packages Folders"
Press "Open Community Folder"
MSFS2024:
https://fselite.net/content/how-to-find-your-msfs-2024-community-folder-and-change-location/