OK. Here’s the EZ solution that worked for me, installing CORE theme using the WPADMIN upload feature. I found the actual theme folder named CORE (or whatever your theme is named) that was 3 levels deep inside subfolders in the zip file. When you find that theme folder that has the actual code ONLY (not the one with the Licensing, Manual and PSD folders), then zip that folder up and then upload that folder thrrough WPADMIN . It works.
HTH . Cheers.