Asset manifest
The Arena client for Mac won't start up. It goes to a screen that says "Asset Error Detected," and when it relaunches the same thing happens.
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Andrew#44813
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NeonWilderness#00853
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I'm encountering the same issue on my side. I've tried uninstalling and reinstalling both MTGA and Epic Games Launcher, verifying files via Epic Games Launcher, restarting the computer, and manually deleting the com.wizards.mtga folder within User/Library/Application Support before reinstalling.
Of note, the iPhone version is working for me.
There are a ton of reddit posts detailing this same issue.