The game uses OpenGL, not D3D8 (only uses DX for sound), but loads it from the system directory directly, so the usual way of installing ReShade does not work. You'll have to use an injector like ENBInjector (
enbdev.com/download_injector_generic.htm
) to inject ReShade into the process.
enbinjector.ini:
[LIBRARY]
LibraryName=ReShade32.dll
[TARGETPROCESS]
ProcessName0=alone4.exe
You can get the ReShade32.dll by launching the setup and then Ctrl + clicking on the button (it will extract it to the current directory).