"PDF Architect Professional" pre-purchase question

Hi,

I'm about to purchase the following product: "PDF Architect Professional" for personal use.

I'm at the checkout stage: "2. SECURE CHECKOUT".

I just noticed the following note in the page: " PDF Architect Professional Plan"

I would like to purchase a one-off license not a plan.

What am I missing?

Best regards,
Enrico Migliore