Can I purchase a license for 1 month/year with no recurring option?

You can purchase it and then deactivate the recurring option in your account management settings.

Once you have made a successful transaction, go to your account in the upper-right corner of the site, click on your name, and select Recurring Payments. You will see all your products there. You have an on/off toggle next to each product. You can switch off the automatic billing and then switch it on again.

There is no limit in how many times you can do that within the period that has already been paid for. If you switch it off and the period you’ve paid for elapses, you cannot re-activate the automatic payment. You will have to make a new transaction.