The last version in the "Previous Release" table does not require activation. If you use that version you will not have to purchase anything.
Beyond that, it depends on when you purchased the tool. You can use any verion of the software released in the year after purchase of your tool... as per your maintenance and support agreement.
If you need to use a version that was release after the end of your maintenance and support contract, you will need to purchase an extension of that agreement. Here is the link to the purchase page in the Raisonance catalog:
- http://www.raisonance.com/MCU-ARM-Suppo … pport.html