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If you have a look you will see the admin directory was automatically renamed--part of the 1.5.5x install procedure.

Is it safe to say you are up and running now?

To my knowledge Zen Cart has never provided a public_html/.htaccess file so you are not missing anything there. The blank page problem can be researched using the Wiki or FAQ section, links at top of...

NO!

Can you provide what is in the public_html/.htacces file?

You seem to be moving pretty quick with trying different things and getting various errors msg. because of that. Between the time...

What are you upgrading?