Never mind. This response got me going down the right track.
Since I bought bought 2020 and 2024 via Steam, I found that exe.xml for 202 lives in C:\Users<user name>\AppData\Roaming\Microsoft Flight Simulator, so I copied it to C:\Users<user name>\AppData\Roaming\Microsoft Flight Simulator 2024\ , and the plugin loaded when I ran 2024.
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