I buy 0.5c version, did I must pay for 0.6?
Just scroll down the comments. There you will find valuable information. I only spend $ 5 too. Wait a little bit :)
If you spend $ 10, you will receive all subsequent versions on release day. You spent $ 5 - this means that you will also receive the latest version, but 1-2 weeks later. For $ 10 it's early access.
