If you haven’t already redeemed the Download Access Code (DAC), then you can simply redeem it now and it will provide a license for Cubase 14.
If you redeemed the DAC, then it will depend on when you redeemed it. If it was after 8 October 2024 then you’ll be entitled to a grace period update.
More info here: https://helpcenter.steinberg.de/hc/en-us/articles/115001891190-How-to-verify-eligibility-for-free-Grace-Period-update