unable to download/export project

Please make sure incognito mode is off when using PS Web. If you are still not able to export after turning that off, please let us know.

You probably need to address the (literal) underlying issue. There is a message that says you do not meet the minimum system requirements or you are running your browser in a potentially restrictive mode. Either of these could cause an error to occur.

What version macOS and internet browser are you using?