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Did Chrome change CRX format recently? Getting "crx_header_invalid" error. 0 Recommended Answers 23 Replies 293 Upvotes
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I wrote a Chrome extension for work long ago.  It has worked for years.  But today, trying to install it on a new computer, Chrome reported "crx_header_invalid".  Did the CRX file format change recently?  I see no notice of such a change, but when I regenerated the CRX from the original app using a current version of Chrome, it worked again.

Does anybody know if the CRX format changed recently, or if signing policies have changed, or something else?
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Same here. As soon as I updated to Chrome version 73.0.3683.86 (Official Build) (64-bit) this started happening to me as well. Looking for a workaround as we speak.
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Same here :/
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Tim Bessie your post here actually led to my solution. I was getting this same crx_header_invalid error, for brave browser then I did this (in the link) --which is what you're saying-- with the latest version of chrome https://www.cnet.com/how-to/how-to-install-chrome-extensions-manually/   and it worked.
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Stanford - I'm glad this helped; unfortunately, the problem isn't the method of installation (my Chrome app isn't in the Chrome Store, it is always installed manually); the problem is apparently someone changing the Chrome CRX file format without notifying anybody (at least, I can't find mention of it anywhere on the Chrome developer groups/sites or in any release notes).  This is a BIG change and should have a BIG notice.
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What actually changed was that in the newest Chrome version, CRX3 extension packing format is now enforced. So, the extension you are installing needs to be repacked in CRX3 format.
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Anybody has any idea, How can we repack any chrome extension in CRX3 format.
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I found this npm package https://www.npmjs.com/package/  which allows you to pack it as CRX3
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Same, I'm trying to pack and install a custom chrome background I just made and it says the crx format is required??
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I'm experiencing a similar issue, with a slightly different error message: CRX_REQUIRED_PROOF_MISSING

Installing a crx works for some people but not for others.

Chrome Version 75.0.3770.80 (Official Build) (64-bit)
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For devices that are managed (by a school or business for example), you cannot switch into dev mode. Is there a way around this for it to still work?
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