Is it possible to "upgrade" without using the full amount for a higher offer?

For example, I bought the game for $3.99 and I want the art pack. Would I be able to get it by paying an additional $6, or would I need the whole $9.99?

Hello,

I'm 99% sure there's a running total tied to your itch account, so you just need to pay the $6.

Thank you!!

I just checked and it only lightened up if I set the purchase price to $9.99. I then did another check for info from itch (I have a hard time figuring out words) and it seems to be a commonly requested feature that hasn't yet been implemented. They suggest paying full price and asking for a refund :s

I'll just wait until next month when I can fully afford it.

https://itch.io/t/2473116/pay-the-difference-or-pay-again

https://itch.io/t/1489111/question-regarding-pay-what-you-want-price-and-upgradi...