Silicon IndiaBangalore: August 20th is the last date to download the "release candidate" version of Windows 7, after which its free downloading will be discontinued. Microsoft, which has been providing free, unlimited downloads of the candidate version till now, plans to put Windows 7 on sale in about two months, reports CNET News.This is a last chance for users who have failed to upgrade from Beta Build 7000 to the RC Build 7100 bits. Microsoft's announcement to halt the download of Windows 7 RC came during the second half of June 2008.Windows...