I just recently took over development of Business Manager (and its extensions). I haven’t had enough time to thoroughly review the code for the Payroll extension or update its software licensing implementation yet so I’ve decided to remove it from the site for now.
I’m hoping to get to that review done soon but I have two releases for the base plugin I want to get out first.
The other extensions, Custom Fields and Asset Manager, have been reviewed and updated since I took over for anyone reading this that is interested in checking them out.