Answer
Business Reporter itself isn't certified to run on Mac — the practical options are running it inside a Virtual Machine or a Citrix environment. If the Mac user only needs to view already-built reports rather than develop new ones, Business Reporter Execution Server (BRES) is a better fit: BRES runs and renders the report server-side, so the Mac user can view the output without needing the Business Reporter client (or its Excel add-in) installed locally at all.