How to install Nimbus on Epic Games Store
Same loader, slightly different launch flow because Epic uses URL handlers instead of Steam's protocol.
The loader is the same binary on every platform — Nimbus does not ship a separate Epic build. Follow the standard install steps from the Steam guide for download, extraction, and Defender exclusions.
Where Epic differs: Nimbus launches Marvel Rivals using Epic's URL handler (com.epicgames.launcher://apps/...). The first time this happens, Windows may show a one-time prompt asking which app should handle the URL — pick Epic Games Launcher and tick Always.
Confirm Epic is signed in. Open the Epic Games Launcher and sign in once before clicking Launch Game in Nimbus. If you're signed out, Epic shows its login screen instead of launching Rivals — Nimbus interprets that as a failed launch and goes back to the idle state.
If both Steam and Epic show Marvel Rivals as installed, Nimbus prefers Epic. To force Steam, open the Settings tab and switch the Launch source dropdown.
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