What kind of updates were you thinking of? Product discount is unlikely. If gamemaker receives an update that means this doesn't work any more, I'll update it yes, apart from that, if you have any ideas on how to improve it, I'm listening :)
Are you going to do it? Great asset, but I think you should improve it a little bit. For example, make the size not based on the size of the sprite, give it exact values in the item settings. remove useless list and map requests that make fps unplayable in combination with other mechanics. Well, as an additional cool opportunity, make an inventory with scrolling