CCleaner Professional - one time cost, or yearly subscription

I am sorry for this question but I have not been able to find the answer on the Piriform Website and I apologize if I overlooked it. I have used CCleaner for years and have contributed money to the company a couple of times in the past but have always used the free version. Is the professional version a one time payment or does one need to pay again for use of the updated software on an annual basis?

Yearly

Hi, Mezzukron. :)

Some info at:

http://www.piriform.com/legal/software-license/ccleaner-professional

Thank you for your responses.

Hi,

I was about to make what I thought was a once off payment. When I was about to complete the payment from my Pay Pal account there was a message from the company stating that I was agreeing to them making periodical charges to my account. That was the first indication that there were to be ongoing subscription payments. I declined to go ahead.