I already did "Launch License Setup". It had no effect.
This thread (http://e2e.ti.com/support/development_tools/code_composer_studio/f/81/p/305959/1065790.aspx#1065790) led me to believe that the evaluation countdown should stop when the XDS100 license is activated as opposed to the other way around - having to wait for the evaluation to expire as you say.
I'm just trying to avoid any unpleasant surprises in 27 days.