as Tronimal said, a full zip download is not a good idea.
But since you are an organizer, you may want to keep things organized...
I made a playlist (for myself) to keep track of played games quickly (and offline) after I downloaded all of them.
I was just using it internally but decided to share.
May be helpful for you:
https://itch.io/blog/535668/a-personal-playtracker-for-game-boy-showdown-2023