Epic Launcher keeps crashing on downloading Unreal Engine

I am unable to download Unreal Engine and here is the log file after last time crashing of Epic Launcher. I had Unreal Engine 4.9.2 before on Windows 7. Now I am trying to install latest 4.12 and it keeps crashing. I was first trying on Windows 10 but it kept crashing. So I thought may be I should go back to Windows 7 but it keeps crashing here as well. Log file after recent crash is attached here.

Can you tell me what I am missing? Should I do something before trying to install Unreal Engine? I don’t have Visual installed on Windows 7 yet but it was installed on Windows 10. This is the dxdiag text file for reference.

Hi Faisal Aslam,

I’m sorry that you are having an issue with the Epic Games Launcher. In order for us to offer the best support, we have recently modified the process for how Epic Games can help troubleshoot your Launcher issue. Please visit http://help.epicgames.com/ for technical support, here you can find information and solutions for common issues, as well as a contact form if you still need additional assistance. To access the contact form, please use the “Email Us” button under the “Contact Us” section. Thanks!