Toad for oracle installation error

Hi,

I have licensed version of latest toad for oracle 12.7.0.121, when i tried to install it i got the follwoing message

While attempting to install ToadForOracle_12.7.0.121_x86_En.msi the following error(s) occurred:

HTTP Error: Unable to reach file service. Please check your internet connection.

An offline version of this installer is available for download at support.quest.com/

But i checked the internet connection and everything is fine and no problem so how i can solve this issue and how i can install the offline version because i checked on the mentioned link and every time ponting me to the online version.

Thanks