Affiliate Plugin

I’m interested in WPMU Affiliate plugin. I want to be positive that this plugin is not for a multi site, I have a single site. Also, I read it integrates with Marketpress, which I have installed on my site. I had a problem, error, installing a multi site plugin that required me paying someone to correct the problems.

Not sure what integration with Marketpress really means. So please indulge me. I do not want to install a multi site plugin on a single again, but want to understand integration with Marketpress.

I don’t want to perceive something that isn’t going to happen or creates a problem.

Thanks much, I look forward to hearing from you.