I think there’s a way to retrieve an array of supported versions via official API as far as I’m concern.
https://papermc.io/api/v1/paper should return supported versions.
https://papermc.io/api/v1/paper/(version)/latest/download should return the jar file.
I think the list should be parse-able and the versions can be used to replace the placeholder to get respective jar file.
I read these from https://paper.readthedocs.io/en/stable/site/api.html
Yet, Thanks for your great work.