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Have you understand this concept: ?

I cant download woocomerce

You must choose: If you don’t care about your current main domain,you can just add the domain to your current hosting account via Addon Domain menu on your CPanel. Main domain will be assigned to main htdocs folder on File Manager menu. For example,your current main domain is example.epizy.com,then you add other domain example.com. example.epizy.com files will be inside main htdocs folder. example.com files will be inside example.com/htdocs/ folder. You can’t change your main domain. If y…

If you added your other domain via Addon Domain,each domains have their own folder.
If you don’t wanna like that,you have to use Parked Domain.
Check your Addon Domain menu again. Is the Document Root/folder for that domain even exist? Or has it been assigned correctly?