Hi , I dont have a preference for sellfy or gumroad they both seem the same to me. Yes the demo scene is included in the pack. The sellfy and gumroad packs will be updated the same as the marketplace one, they will all have the same content and they will also have new trees etc added to them, if anything they will actually get updated before the marketplace pack as I do it myself.
As I will just update the zip file you just log in and re-download the pack on gumroad or sellfy to get the latest one.
SaOK, thankyou for purchasing my animal pack! The license will be the same as the epic one. Life time use in games etc. I dont mind what people do with my packs as long as their not reselling the assets.