The latest driver is 14.42.15.64.5420, released 08/30/2012, so it's possible it's just too old and doesn't support Aground. To get a refund, you'll have to contact itch.io: https://itch.io/docs/legal/terms#refunds (if you bought it on steam too, you'll have to request the refund there as well: https://support.steampowered.com/kb_article.php?ref=6695-QIKM-7966). I cannot process refunds myself, but they both allow refunds for games that don't run, so it should be pretty easy.