I’d like to inform you that there’s an issue with the download button on expo.dev, as it consistently results in a 404 error. I’ve conducted tests with various builds, both new and old, and each time I access a build on expo.dev and attempt to download it, I encounter this 404 error. It appears that neither the Build SDK versions nor any other build parameters have any impact on the outcome. It seems there may be an error in the generated bundle ID within the download URL.
I have the same problem
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I am facing same issue on Download Build button on Expo.
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I have the same problem
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Same here
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A good workaround: Hit refresh after 404. And here is your aab 
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They’re aware of it and working on a fix
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for the devs’ information…
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OK, it’s fixed now. I’ve just confirmed that I can download a build now that was failing previously
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I confirm, too 
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Great, works for me too. 
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Thank you for sharing and good luck on your project.