Starting with Excel 2011 Service Pack 1 (Version 14.1.0), Solver is once again bundled with Microsoft Excel for Mac.
If you're still using Excel 2008 for Mac, you can download Solver for Excel 2008 here - but we highly recommend an upgrade to Excel 2011, for many reasons including a better Solver! When your model gets to big for the free add-in contact us about upgrading. Over 100,000 existing “cloud Solver” users will receive the new version automatically. Users can obtain Solver immediately from Microsoft AppSource. Get the new Solver App for Excel 2016 and Excel Online this free Solver app works equally well in desktop Excel 2016 and Excel Online – and handles the smallest to the largest, most challenging optimization models.
Mac Users Using Excel 2016 or Excel Online