Purchased the game under the previous page ending in v0.27 and the v0.28 page tells me to purchase it again. The 0.27 page only has the v.4157 link for me, does not show the v.4188 link. You might've addressed this somewhere, but I'm not seeing it on the main page.
All previous owners were sent a key for this page. And this was addressed on the previous page explaining the reasons for our moving over. Check your email and spam inboxes for the invite. It will be sent to the email the original purchase originated from, not from the current email connected to your itch account.