I downlaoded Thunderbird 102 and run it from an executable file. I didn't want the flatpak or deepoin store version as they are Thunderbird version 115 which I don't like. Thunderbird runs OK but the desktop shortcut icon is the file icon with a couple of gears on it. I have found the proper icons in the Thunderbird icon folder but can't see how to change the desktop icon properties to the correct icon?

On windows I would just right-click the desktop shortcut and change the icon in the properties menu. Can any one help?

Thanks