When we purchased a license last year there was only one option, not being a student, and that was the perpetual license, this did not include the updates. The updates are an additional yearly cost.
I don't know if this is entirely true or if it was some sales tack but apparently if you purchase a license and don't pay for the updates if you then later want to update, say in two years time, you have to back pay for the update subscription you missed out in those two years.