Oh, I didn't know about this. From what I found out, it seems that as long as you pay a total amount equal or higher than the set price, you can download any file, even if it's from different versions.
@all: Someone who has purchased version 0.6.0, please verify for me if you can download version 0.6.5?
If you guys have indeed purchased version 0.6.0 but cannot download version 0.6.5, I can send you the download link via email :)