Hello MBAZABAS,
From looking at your log file, this seems to be the main cause of your issues:
MainFrameActions: Cooking (Windows): WindowsPlatform.get_Compiler: WARNING: Visual C++ 2015 toolchain does not appear to be correctly installed. Please verify that “Common Tools for Visual C++ 2015” was selected when installing Visual Studio 2015.
This is appearing due to not having Visual Studio 2015 installed and/or not having all of the necessary components to use it with UE4. If you do not have it installed, please download the installer from Microsoft’s website here. There are a few choices, while only Express, Community, and Professional are supported for UE4. Community is the most generally used choice but be sure to review its terms of use before deciding on a version.
If Visual Studio 2015 is installed, please open your Control Panel > Programs and Features and select Microsoft Visual Studio 2015 and click “Change”. Once the setup opens, click “Modify” and you’ll see a list of components. Please check the box for “Common Tools for Visual C++ 2015” under the “Visual C++” tab. Please note that this is not the same as the option below called simply “Common Tools”.
Once these features have been installed, you should be good to go. If this is a blueprint project and you’re wondering why you need Visual Studio, this would be due to some of the plugins you are using requiring compiling when you attempt to package. One example is the Oculus plugin. You can find other examples of this in the log by searching for the words “Error” or “Warning”.
Hope this helps!