I used PayPal to buy the DLC and I had no issue with it at all. It's the main way to purchase things on itchio after the purge last year. If you're having issues, I think that's an issue on PayPal's end and I would contact support on their end for guidance. Also... if you're 21 years old... forgive my insensitivity but I don't think $2 is egregious in the slightest. Most games charge a lot more for that.