Excel for Mac 2016 includes the Solver and Data Analysis add-in built-in. You do not need to install and run the 3rd Party Solver or Data Analysis add-in.
Install Solver Add-in for Excel for Mac 2016
Open Excel for Mac 2016
Go to the Tools menu, select "Add-ins"
Check "Solver Add-in" and "Analysis ToolPak" then click OK
Select the "Data" tab, then select "Solver" or "Data Analysis".