If you do not have PayPal Account, you can pay using Credit Card or other payment options-
For Business Edition- https://stackpi.onfastspring.com/stackpi-business-suite
For Open Source version- https://stackpi.onfastspring.com/stackpi-business-suite-open-source-edition
Please note that purchasing using other payment option is manual. You will have to contact us after purchasing to approve your payment & enable downloads in your Account. Purchasing with paypal is automatic.