0.6 wasn’t on this page, it was on another that no longer exists.
Previously on the old page you were purchasing individual updates, rather than the game like it is now.
If you bought the VN before from this page, then you should be able to access the updates via your Library.
Discord
The price is for the game (plus all future updates)
The public (“free”) version is given to those that are active on my Discord server.
