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If you wish to purchase with a credit card, rather than with a PayPal account, it is possible but still requires using PayPal as a payment portal. You won't have to log in.
On the left hand side of the first PayPal page you come to during the purchase process - the one with the login box on the right-hand side (see screenshot below) - you should see the following paragraph below the account login blanks:
"Don't have a PayPal account?
Use your credit card or bank account (where available). Continue"
Please click on the continue link, and this will take you through to a page where you can pay through PayPal with a credit card without actually creating or requiring a PayPal account.