(I removed the theme link because there's nudity on that page, which by the way leads me to trust the quality of the theme even less.)
Ok, the plugin installer only accepts .zip files, not folders. Re-installing won't change that.
Here's what I'd do:
1. Don't do this.
2. Access your server via FTP or SFTP, navigate to /wp-content/plugins/ and upload each folder in the plugins.zip provided by the theme's designer.
3. Do this.
4. Access your server via FTP or SFTP, navigate to /wp-content/themes/ and upload the theme's folder.
5. Do this.
6. Ignore this. If the theme fails because you install more plugins, it's a terribly coded theme and you should demand a refund immediately.
7. Bonus step, contact the theme's designer and let him know that the instructions need to be re-considered.