We don't know in which drive and folder you've installed your IL-2 1946 and C.U.P. but ..... not few new comers missed his error log file even that was created there.
Please search it again carefully.
The beginning of the correct error log is like here:
[Aug 3, 2016 2:00:16 PM] ------------ BEGIN log session -------------
[2:00:16 PM] OpenGL provider: Opengl32.dll
[2:00:18 PM] OpenGL library:
[2:00:18 PM] Vendor: ATI Technologies Inc.
[2:00:18 PM] Render: AMD Radeon HD 6550D
[2:00:18 PM] Version: 4.2.11762 Compatibility Profile Context
[2:00:18 PM] Extensions: GL_AMDX_debug_output GL_AMDX_vertex_shader_tessellator GL_AMD_conservative_depth GL_AMD_debug_output GL_AMD_depth_clamp_separate
[2:00:18 PM] Size: 1920x1080
[2:00:18 PM] ColorBits: 32
[2:00:18 PM] DepthBits: 24
[2:00:18 PM] StencilBits: 8
[2:00:18 PM] isDoubleBuffered: true
[2:00:18 PM] DirectX Joystick NOT created: DirectX joystick driver: device not attached
[2:00:18 PM]
[2:00:18 PM] *** Looking for Advanced CPU Instructions...
[2:00:18 PM] [x] PentiumPro
[2:00:18 PM] [x] Multimedia (MMX)
[2:00:18 PM] [x] 3D (SSE2)
[2:00:18 PM] [x] 3D (SSE2)
[2:00:18 PM] [x] 3D (3DNow)
[2:00:18 PM] ColourBits 32, ABits 8, ZBits 24
[2:00:18 PM]
[2:00:18 PM] *** Looking for Render API Extensions ...
[2:00:18 PM] [-] 'GL_EXT_paletted_texture' extension - Palettized textures (8 bit RGBA palette).
[2:00:18 PM] [-] 'GL_EXT_compiled_vertex_array' extension - Compiled Vertex arrays.
[2:00:18 PM] [-] 'GL_EXT_clip_volume_hint' extension - Frustum clipping optimization.
[2:00:18 PM] [x] 'GL_EXT_secondary_color' extension - Secondary Color for 3D fog & specular optimization.
[2:00:18 PM] [x] 'GL_EXT_separate_specular_color' extension - SeparateSpecular for 3D fog & specular optimization.
[2:00:18 PM] [x] 'GL_ARB_multitexture' extension - Multitexturing.
[2:00:18 PM] [x] 'GL_EXT_texture_env_combine' extension - Multitextures advanced combining for special effects.
[2:00:18 PM] [-] 'GL_NV_texture_env_combine4' extension - Multitextures advanced combining for special effects.
[2:00:18 PM] [x] 'GL_EXT_texture_env_dot3' extension - Dot3 Bump advanced combining.
[2:00:18 PM] [-] 'GL_NV_depth_clamp' extension - Corrects Shadows rendering
[2:00:18 PM] [-] 'GL_NV_texture_shader' extension - NV Pixel Shaders
[2:00:18 PM] [x] 'GL_ARB_texture_compression' extension - Saves texture memory by 400%
[2:00:18 PM] [x] 'GL_EXT_texture_filter_anisotropic' extension - Anisotropic texture filtering.
When much deep core classfiles (like GUI.class) make version mismatching by wrong mod selection or installing steps, we often get no meaning error log because of the crashing occurs in very early stage of starting-up. Even it, the error log file is created in each crashing time (only stopping its recording around 40 lines without showing any error suggestions).