This post is to give a suggestion of additions to the itch.io app.
There is a game on the site that you can download quietly but not in the applicative because in the intall function there is nothing available.
So my suggestion is to add a manual install option. Where you simply downloaded the game on the website and there in the application you choose the executable file of the game.
Example of game that cannot be installed:
https://teamterrible.itch.io/the-baby-in-yellow
And the late adobe flash player flash games.
Add a function that it downloads the .swf file into the computer and runs it with a portable flash player.
Game example:
https://awkwardsilencegames.itch.io/one-chance
If you want the portable flash player I have one that I'll leave the link for you: https://drive.google.com/file/d/1_CBRwGHcADEILzHpqt1pTwh7QXfsSs9e/view?usp=shari...