Since you selected the code size limited option it is not showing you the 90 day one anymore. There is still a way to get it though. The link in this FAQ will enable you to generate a 90 day license and then you can just drop it into /ccsv5/ccs_base/DebugServer/license and it will pick it up.
http://processors.wiki.ti.com/index.php/FAQ_-_CCSv5#Q:_Where_is_the_link_to_the_90_day_eval_license.3F
Regards,
John