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When this Launcher error code 15 occurs, it shows a message The game was not launched via the Steam client. Moreover, if games on Steam are lagging or running slow, then we have a guide that can help you fix the issue. If you are facing issues where the downloaded game does not show up in the library, you can check out this guide for solutions.
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This is not the only error that Steam users come across very often. This error has been reported for almost all major games on the Steam Client. Launcher error code 15 has been reported by dozens of gamers.
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Home › Gaming › Steam › Launcher error code 15: The game was not launched via the Steam client
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