Solver was added to Microsoft Office for Mac 2011 in Service Pack 1. You can download and install Office for Mac 2011’s Service Pack 1 by clicking on the link below:
When you have installed Service Pack 1 (SP1), follow these steps to start Solver:
a. Start Excel.
b. Click Tools -> Select Add-Ins.
c. Click to select the check box for Solver.Xlam.
d. Click OK.
The Data Analysis Toolpak was removed in Mac:Office for Mac 2008. However, you can download a free third-party tool that offers similar functionality: