@maxmustermann >checks license
>It's proprietary
It lists the Lesser GPL in the license list, but the release doesn't seem to meet the requirements of any version the lesser GPL.

Checking the list of dll's, I can't seem to see any LGPL'd libraries;
DLL Name: SDL2.dll
DLL Name: OPENGL32.dll
DLL Name: glew32.dll
DLL Name: SDL2_image.dll
DLL Name: SDL2_mixer.dll
DLL Name: SDL2_ttf.dll
DLL Name: AntTweakBar.dll
DLL Name: SHLWAPI.dll
DLL Name: steam_api.dll
DLL Name: USER32.dll
DLL Name: MSVCP120.dll
DLL Name: MSVCR120.dll
DLL Name: KERNEL32.dll

I reckon then either a LGPL'd library isn't being used, or the developer needs to provide object files, allowing the user the freedom to modify the LGPL'd libraries and relink the software.