I have bought Dragon Vally but it wont let me Download it!

When you download through the purchase history the launcher needs to open and the file needs to download to the download radio button. A failure to download may be the game needs to be updated, Origin may need to be updated, not enough free space on your system drive, your antivirus may be blocking the download, or it may be a user rights issue. The most common problem is Origin and the game is not up to date but there are many other issues that may conflict with the download.