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You don't have Paypal buyer protection cover as a guest buyer but you can contact customer services and they may be able to assist you by reaching out to the seller for you.
So If you need help for a guest buyer transaction then you can;
1. Phone Paypal customer services and see if they will help you.
2. Contact your card issuer for a chargeback.
Try reading paypal olivias reply on this post about a guest buyer transaction.