Sellfire Affiliate will not install…

Cannot install in WP 3.5.1. Getting following message. So how do we get around this?

The following themes are installed but incomplete. Themes must have a stylesheet and a template.

Name Description
sellfire-affiliate-store-builder Stylesheet is missing.

Loy Banks
[ redacted, support is offered via the forum and not email ]

http://wordpress.org/extend/plugins/sellfire-affiliate-store-builder/