This is an asset pack, all graphics, no code. As such, it doesn't have bugs, there were some minor art issues. Also this asset has always been paid, and always been marked as in development. There is more than enough information on the product page for people to make an informed purchase.
Edit: After seeing another comment, I realise you may be confused by itch.io's UI, and the fact it lets people purchase things they already own, and that's not my fault.