If you paid the $10 here, you should be able to download the game from here.
If you've paid it cumulatively on Patreon/Subscribestar, just send me a message on that site and I'll give you a key.
Patreon.com/EroDungeons
subscribe to the warrior tier for the $10 version, the noble tier for the $18 version
If Patreon also doesn't accept your card, consider using JAST: https://jastusa.com/games/mdwk001/ero-dungeons