If all you are doing is changing the URL, then just upload your current files to the new directory, edit the config files to reflect the new information and then Import your database to the new one. No need to do a fresh install if the ZC version is the same.

As to your .htaccess for the old URL

RewriteEngine ON
RewriteRule old_dir/*.(*) http://meditationstore.net/

What happens is that anyone going to http://meditationstore.net/old_dir/ (any page)
is automatically redirected to http://meditationstore.net/ .

Always make sure to immediately test any .htaccess changes.