Hello is it possible to have an installer for people downloading your game, from Steam for example?
What do you mean? If you are thinking about putting games on a store like steam, it will require a fee of $100, but alternatively, you can just post your game on itch.io for free.
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You don't need an installer for Steam, you simply upload your game files and Steam will handle installation.
If you need an installer for other sites, then you could look at something like Inno Setup jrsoftware.org/isinfo.php
Awesome thank you