Yes, authorisation would be the key here. Are you sure you did not activate the trial license. As that has a limitation on the amount of variables you can enter.
To test what license you have in your SPSS, simply open a new syntax window and type in;
Then "run" and select "all". This will show you if you have a temp license or permanent license. If you are on a temp license, return to the wiard and enter you authorisation code again.
All the best
Here to help with any licensing or installation problems.