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Not launching or crashing

Support's list is restart Steam, use a stable network, confirm Steam is online, wait out a rollout, and send the error log.

Steam screenshot of Lost in the Underdark: a level 50 purple worm and Rosie selected at level 175.Steam screenshot of Elturel's Last Stand: Tiamat breathes fire while Minsc is selected at level 460.

The sourced answer

For the Steam client, the support page recommends restarting Steam, checking the network and confirming that Steam is online. During a service rollout, allow time for the update before retrying. If the problem persists, send support an error log with the affected platform and system details.

A launch failure on Epic or a crash on a phone may have a different cause. Record when it happens and whether the client reaches the title screen, then use the game’s support channel. The Portuguese troubleshooting page covers the same general checks.

FAQ

What does support ask for?

An error log, the Steam account, and the system, after the four checks above.

Does offline Steam work?

Support says the game does not load while Steam is in offline mode.

Related

Sources