oh. . . i just made my big mistake, i didn't saw the "Current version" so i thought i was using the 1.0.0 one, but it was 0.6.2 ._.
i use the current version (beta 0.6.2) as clicked on the big button in download section of the page
while i'm leaving it rendering i was still opened Skype and Google Chrome, maybe these 2 programs ate the RAM and finally making the video blackly?
and i was trying to Restart my computer to make the RAM freshly empty then rendering it, but still black though.