There are posts everywhere… but no way to download it.
its in your learn tab on the launcher
edit: on second thought, looks like they removed it.
i heard they had an archive of somesort but don’t remember the link to it.
Epic moved some of the demos back to marketplace again. It’s bit odd thing as they originally had all their content there but decided to move them into learn tab at some point. Now they did the opposite…
They can be found here: Free Epic Games Developed Content and Digital Assets - UE Marketplace
Direct link to Showdown VR demo: Showdown VR Demo in UE Legacy Samples - UE Marketplace