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from OpenChart.log:
[2020年12月23日 12:38:30.756] INFO ------------------------
[2020年12月23日 12:38:30.774] INFO Initializing...
[2020年12月23日 12:38:30.774] DEBUG Set current directory to E:\Openchart
[2020年12月23日 12:38:30.775] DEBUG Setting up file formats.
[2020年12月23日 12:38:30.775] INFO Finding noteskins...
[2020年12月23日 12:38:30.869] ERROR Exception while trying to load noteskin 'default_arrow'.
System.DllNotFoundException: Unable to load DLL 'SDL2_image' or one of its dependencies: Den angitte modulen ble ikke funnet. (0x8007007E)
at SDL2.SDL_image.INTERNAL_IMG_Load(Byte* file)
at SDL2.SDL_image.IMG_Load(String file)
at OpenChart.UI.Surface.LoadFromFile(String path)
at OpenChart.NoteSkins.NoteSkinManager.loadKeyModeSkin(NoteSkin noteSkin, Int32 keyCount, String path)
at OpenChart.NoteSkins.NoteSkinManager.loadNoteSkin(String path, String skinName)
at OpenChart.NoteSkins.NoteSkinManager.LoadAll(String path)
[2020年12月23日 12:38:30.886] INFO Ready.
[2020年12月23日 12:38:30.886] INFO Displaying main window.
[2020年12月23日 12:38:30.941] FATAL Uncaught exception: System.NullReferenceException: Object reference not set to an instance of an object.
at OpenChart.Application.Run()
at OpenChart.Program.Main()

[2020年12月23日 12:38:35.413] INFO ------------------------
[2020年12月23日 12:38:35.429] INFO Initializing...
[2020年12月23日 12:38:35.429] DEBUG Set current directory to E:\Openchart
[2020年12月23日 12:38:35.430] DEBUG Setting up file formats.
[2020年12月23日 12:38:35.430] INFO Finding noteskins...
[2020年12月23日 12:38:35.515] ERROR Exception while trying to load noteskin 'default_arrow'.
System.DllNotFoundException: Unable to load DLL 'SDL2_image' or one of its dependencies: Den angitte modulen ble ikke funnet. (0x8007007E)
at SDL2.SDL_image.INTERNAL_IMG_Load(Byte* file)
at SDL2.SDL_image.IMG_Load(String file)
at OpenChart.UI.Surface.LoadFromFile(String path)
at OpenChart.NoteSkins.NoteSkinManager.loadKeyModeSkin(NoteSkin noteSkin, Int32 keyCount, String path)
at OpenChart.NoteSkins.NoteSkinManager.loadNoteSkin(String path, String skinName)
at OpenChart.NoteSkins.NoteSkinManager.LoadAll(String path)
[2020年12月23日 12:38:35.523] INFO Ready.
[2020年12月23日 12:38:35.524] INFO Displaying main window.
[2020年12月23日 12:38:35.568] FATAL Uncaught exception: System.NullReferenceException: Object reference not set to an instance of an object.
at OpenChart.Application.Run()
at OpenChart.Program.Main()

Den angitte modulen ble ikke funnet --> The specified module was not found
I should also note that i tried to install this on my E:/ drive, and not on C:/