Book 6: Utterly Dwarfed (+2020 Calendar) now w/ reduced shipping to Europe + Canada

[The Aboleth]

Attempting to pre-order the PDF, I get an error message that "your card was not charged, please contact Gumroad". Does this work for other people?

My guess is either a typo in the card number, or a problem with the card itself. I would try re-typing the card number first; if that doesn't work, try contacting the bank that issued the card.

I had a similar issue years ago with an OOTS item and it was because the bank did not recognize the vendor (Ookoodook, in my case). They halted the purchase until I confirmed that yes, I was in fact ordering a stick figure comic book for myself. So I would contact your bank if you continue to have issues.