Unable to Launch Game on Steam After Update 4.04

[drackentv]

Description:
After updating to version 4.04, I am encountering an issue where I am unable to launch my game on Steam. Whenever I attempt to start the game, an error message appears with the text "Failure - Incorrect Platform."

Steps to Reproduce:

1. Ensure that the game is updated to version 4.04.
2. Open the Steam client and locate the game in the library.
3. Click on the "Play" button to launch the game.

Expected Behavior: The game should launch successfully and be playable after the update.

Observed Behavior: Upon attempting to launch the game, an error message is displayed: "Failure - Incorrect Platform."

Additional Information:

• Operating System: Windows 10
• Steam Client Version: 1690583737
• Game Title: The Witcher 3: Wild Hunt
• Game Version: 4.04

Attachments: screenshots of the error message

Impact: This issue prevents me from playing the game entirely, causing frustration and inconvenience.

Note: I have attempted to verify the integrity of the game files through Steam and have also restarted steam & my computer, but the issue persists.

 

[LeKill3rFou]

That's annoying
I google the issue and for many, for various games, it was a "Steam issue", like here :
According to some, just uninstalling/reinstalling Steam fixed the issue. So maybe worth to give a shot in case.

Entire library giving me "invalid platform" error :: Help and Tips

steamcommunity.com