Navigate to your "Applications" folder in "Finder" by clicking on the desktop, and pressing keys Command + N.
Navigate to directory "IBM/SPSS/Statistics/26" and double click file "SPSS Statistics License Authorization Wizard" to start the licensing wizard.
Click "Next".
Check radio button "Autorized user license ..." followed by "Next".
Enter the license code from your email followed by "Next".
On the next page you'll see the button "Finish". That completes the installation.