I don't like this month to month payment for using adobe products. I would like to just buy my software and be gone. I wouldn't have to worry about another company being hacked while they have my personal information. What if something serious happens that I cannot pay the month to month, is my data, held hostage until I can scape up the cash? What is another PDF program that is comparable to these products? Old article, but it could happen again.....
Adobe Hacked, Data for Millions of Customers Stolen
I understand that you are looking to purchase a license with a single (one go) payment. I would like to inform you that Adobe used to sell the perpetual licenses earlier but this option is not available any more.
The current product version that Adobe is producing and selling is Creative cloud subscription in which you have options to pay either monthly or yearly. Please refer the below link to get information related to different plans and pricing. Thanks!