Hi! Sorry to hear you're having trouble. The game is fully released and available for download. Here are a few things to try:
1. Make sure you're logged into the same itch.io account you used to purchase
2. Go to your purchases page: itch.io/my-purchases and find the game there
3. If the download button still doesn't appear, try clearing your browser cache or using a different browser
If none of these work, feel free to contact itch.io support directly. Let me know if it helps!