This is the best way to play your Epic Games library on the Steam Deck, because it doesn't require a launcher
Tap on this, then tap on the little icon that looks ... you'll have your entire Epic Games library there to install from, ...
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How to get Epic Games Store Running on Steam Deck
Relaunch Steam via the desktop icon. Through a browser, download the Epic Games Launcher but don’t open it just yet. First, click Add Game then Add a Non-Steam Game before browsing to /home/deck ...