Now I don’t know. The available information in the manual and what is on-line is conflicting 
Here is a partial copy of the Cubase operation manual for versions Elements 8, AI 8, and LE 8, page 557 that deals with MP3 exports…
“MP3 Export
This version of Cubase provides a function for exporting your audio mixdown as MP3 files. This function is limited to 20 trial encodings or a trial period of 30 days from the installation date (whichever ends first). After this period, the function will be disabled until you purchase the MP3 encoder for Cubase.
•When the MP3 format is selected and you click the Export button, a window opens showing you how many trial encodings you have left. You can upgrade to an unlimited MP3 export function by clicking the “Go to Online Shop” button in the dialog.
This will take you to Steinberg’s online shop where you can purchase the upgrade. Note that a working internet connection is required.”
I think Steinberg needs to update it’s comparison charts and the online shop.
Regards 