Unreal Engine 4.8 fatal error at startup - game-engine

Question

I want to start making games with Unreal Engine 4. So, I downloaded a pre-compiled version of UE4 from a reliable third-party website, which is worked for my friend.
For running UE4, I start UE4editor.exe from C:\UE4\Engine\Binaries\Win64 folder.
When I run it, the following error message shows, the progress hangs on 0% and quits.
Also, notice the address mentioned in error message: D:\Unreal Engine 4.8.0 NV-Techs... which is not correct! As I said before, my UE4 folder is C:\UE4. Whats wrong?!!
What can I do to solve the problem?!!
I attached log and dump files. If any other details needed please tell me.
Thanks for your attention
system specs:
Windows 8.1
CPU: Core i5
RAM: 4GB
GPU: AMD Radeon 6300M series
Log files:
UE4 logs.rar
error message:
---------------------------
The UE4- Editor has crashed and will close
---------------------------
Fatal error: [File:D:\Unreal Engine 4.8.0 NV-Techs\Engine\Source\Runtime\Windows\D3D11RHI\Private\D3D11Util.cpp] [Line: 223]
Direct3DDevice->CreateTexture2D(TextureDesc,SubResourceData,OutTexture2D) failed
at D:\Unreal Engine 4.8.0 NV-Techs\Engine\Source\Runtime\Windows\D3D11RHI\Private\D3D11Texture.cpp:458
with error E_INVALIDARG,
Size=512x512x1 Format=(0x00000035), NumMips=1, Flags=D3D11_BIND_DEPTH_STENCIL D3D11_BIND_SHADER_RESOURCE
KERNELBASE.dll {0x00007ffce1d58b9c} + 0 bytes
UE4Editor-Core.dll {0x00007ffccc08087f} + 0 bytes
UE4Editor-Core.dll {0x00007ffccbec9dd8} + 0 bytes
UE4Editor-Core.dll {0x00007ffccbeaa7a2} + 0 bytes
UE4Editor-D3D11RHI.dll {0x00007ffcc26f4fd4} + 0 bytes
UE4Editor-D3D11RHI.dll {0x00007ffcc26efe51} + 0 bytes
UE4Editor-D3D11RHI.dll {0x00007ffcc269300f} + 0 bytes
UE4Editor-D3D11RHI.dll {0x00007ffcc26df7bc} + 0 bytes
UE4Editor-D3D11RHI.dll {0x00007ffcc26fb586} + 0 bytes
GFSDK_VXGI_x64.dll!VXGI::VoxelTexture::AllocateResources() {0x00007ffcc1f0bbe4} + 18 bytes [c:\p4\sw\devrel\libdev\gi\dev\bugfix_main\giworks\src\gi_voxe
GFSDK_VXGI_x64.dll!VXGI::GlobalIllumination::AllocateResources() {0x00007ffcc1edc2da} + 8 bytes [c:\p4\sw\devrel\libdev\gi\dev\bugfix_main\giworks\src\gi_base
GFSDK_VXGI_x64.dll!VXGI::GlobalIllumination::setVoxelizationParameters() {0x00007ffcc1ed92f1} + 11 bytes [c:\p4\sw\devrel\libdev\gi\dev\bugfix_main\giworks\src\gi_base
UE4Editor-D3D11RHI.dll {0x00007ffcc26c5f19} + 0 bytes
UE4Editor-D3D11RHI.dll {0x00007ffcc26d4260} + 0 bytes
UE4Editor-RHI.dll {0x00007ffcddf3f819} + 0 bytes
UE4Editor.exe {0x00007ff71a1dacee} + 0 bytes
UE4Editor.exe {0x00007ff71a1d241b} + 0 bytes
UE4Editor.exe {0x00007ff71a1d2a6a} + 0 bytes
UE4Editor.exe {0x00007ff71a1e45e9} + 0 bytes
UE4Editor.exe {0x00007ff71a1e55d9} + 0 bytes
KERNEL32.DLL {0x00007ffce31913d2} + 0 bytes
ntdll.dll {0x00007ffce4b35454} + 0 bytes
ntdll.dll {0x00007ffce4b35454} + 0 bytes

Answer 1

I'd suggest just getting an official release off the official github page.
http://github.com/epicgames
You need to register your github account with them. You can follow the instructions here:
https://github.com/EpicGames/Signup
when that is all done, you can get a official 4.8 release by downloading the zip at :
https://github.com/epicgames/unrealengine/tree/4.8
You can then follow the instructions to install a from-source version of UE4.
Otherwise, I'm pretty sure you can get 4.8 from the Epic Game Launcher that most devs are taught to start with.
Hopefully this helps :)