itch.io

I do not understand what you mean with requisits. And your concerns about downloading without reading description. You can have a download message that appears where you actually hit download for a payable game. The "Download and install instructions". 

Change screen width in your example. There are two buttons.

It is as I said

The button changes depending on screen size and if it is paid/web and other factors.

I do not fully understand the matrix of possibilities and what factors are there.

But the biggest factor is screen width. This one is nice example. https://vividev.itch.io/kiosk Put your browser window in windowed mode and hold and change the width of the window to see what the css does with the ui elements. Go to smallest and widest. Change zoom if needed. It has no upper button at the widest. It is visible before the screenshots appear vertical in the flow. And when the tools appear as a banner it still is visible.

Your example is also non payable. The upper download button appears when switching to mobile view. There is no pay what you want button, because you can only download it. I dimly remember a thread about web games and it might be that the lower button is always there and the upper button only if you have payments active or are in mobile view. Or whatever. It might have also to do with banners and backgrounds, but it just is the css that might hide the upper button.

So whatever you optimise here, you still do not know how it looks on a user's screen. You might also want to look how it looks in the Itch app.

Anyways, I would never ever download anything unknown without glancing at the description. And if I were the type of person that would do such, I would also be the type of person that might scroll down very fast and not read your description either.