Question How to solve "CRX_HEADER_INVALID" on Chrome?

Jul 17, 2019
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This question is for a THEME, not for an extension. I'm only finding answers for extensions all over the internet.

I recently had to reinstall the theme cuz I formatted my PC. I was using the same theme since 6-7 years but when I installed (unzip, then drag and drop) it again today, it says

" Package is invalid: 'CRX_HEADER_INVALID' "

and doesn't install it. I've never had this problem until today.

The theme - http://www.chromeposta.com/games/batman-arkham-knight-chrome-theme/
 
Google has, over the years, increased its restrictions for installing third-party Chrome extensions to help protect Chrome users from malicious code. See workaround here:

 
Jul 17, 2019
2
0
10
Google has, over the years, increased its restrictions for installing third-party Chrome extensions to help protect Chrome users from malicious code. See workaround here:

This solves it, but whenever I restart chrome it suggests me to disable dev mode. And when I do, the theme gets disabled again. How do I stop that "disable dev mode" msg?