In the past few months there have been issues with payments being processed by Paypal, but not by itch.io. It doesn’t happen very often, but if it does please don’t hesitate to contact me.
Just send me an e-mail explaining the issue and include the e-mail you used for your purchase.
Please don’t send me a note, or an ask, or even a Paypal dispute. While these do work eventually, sending me an e-mail directly means that any issue is brought to my attention sooner and can be resolved faster.