If you select the one time payment option, YES! You will have to pay just one time, and you will get access to the course and all materials forever.
If you select the five monthly payments option, you will be billed the first payment at the moment of the purchase. The second payment will be billed 30 days after, the third after 60 days, the fourth after 90 days, the fifth and final one after 120 days from the initial purchase.
In both cases, you will receive full access to the course immediately.