Occasionally antivirus software will block the downloading or proper execution of the game. You may need to disable your antivirus software to download the game and then whitelist the following files before enabling your antivirus software.
Click here for instructions on how to access the game folder.
These are the files you need to white list:
For the 64-Bit Build:
For the 32-Bit Build:
Please also submit false positives to your antivirus provider.