Interestingly, this didn't work for Jetbrains. They found people often skipped a year and decided they wanted the "missing" revenue. There answer is to sell the version you "own" as of the date they process your order. You're allowed a full year of updates. However, if you don't continue the subscription then your version automatically rolls back to the version as of your purchase. You lose all the fixes and updates you've been using during the year.