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Paid for a digital product via PP as far as I know PP do not refund in these cases.The product was not delivered for almost a month.
What to do next ?

30 days might be passed the refund window, but if you file a dispute they have to return no matter what, even if they have a no return policy.

there paypal funds for the amount your refunding go into hold when you file a dispute.

contact their support and let them know of your situation...

Do a chargeback :D

Call pp support

Yes, I do agree in filing a dispute. It might take a few days for the processing, but if vendor don't respond in a timely manner, or don't reply at all, you'll get your money back.