We currently have limited customer service staffing due to Coronavirus (COVID-19) safety precautions. We encourage you to find quick answers to your questions by searching the community forum or visiting our Help Center. Thank you for your patience.
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. OR 2. Contact your card issuer for a chargeback.
Advice is voluntary. Kudos / Solution appreciated.