When you click on "get it!", the download should start right away. If it doesn't then something got wrong somehow. Maybe your browser is blocking the download. Maybe it is the pop up which get blocked and the download never start. But when you click on "get it!", the download should start right away.
On my own attempts, the download always start several seconds before the page switch to the "You are now downloading [game x]." page.
The problem is on your end. Simply click back, return to the "get it!" page and try again. If it still don't work try to see if some setting in your browser is not interfering.
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