That solved the J4 download issue, but we are having SEVERAL issues with custom.css and ancient J! remainder files from the quickstart. Whats the best way this can be handled?
For example, we can't have custom.css in /media/css as its not recognized by the template.
The latest issue, is we started a clean slate site and started slowly migrating everything over ( huge job ) and we're seeing these errors in console...
The Cross-Origin-Opener-Policy header has been ignored, because the URL's origin was untrustworthy. It was defined either in the final response or a redirect. Please deliver the response using the HTTPS protocol. You can also use the 'localhost' origin instead. See https://www.w3.org/TR/powerful-features/#potentially-trustworthy-origin and https://html.spec.whatwg.org/#the-cross-origin-opener-policy-header.
UPDATE: using https solved the above issue but I don't know if thats correct behavior or not.
Refused to apply style from 'http://new.bearsampp.com/index.php' because its MIME type ('text/html') is not a supported stylesheet MIME type, and strict MIME checking is enabled.
But these are just 2 of many many issues.