If you choose the one-time payment option, YES! You will pay only once and have access to the course and all the material forever.
If you choose the monthly installment option, the first payment will be made at the time of purchase. The second payment will be charged 30 days later, the third 60 days after the initial purchase, and so on, depending on how many installments you choose.
Regardless of the installment option, you will receive immediate full access to the course from the first day!