I tried compiling the demos and I have a bit of a problem.
I used irrKlang-1.1.0 and copied the required .dll's to the demo2 folder.
I get this error:

demo2d.exe - Entry point Not Found

The procedure entry point ?createIrrklangDevice@irrklang@@YAPAVISoundEngine@1@W4E_SOUND_OUTPUT_DRIVER@1@HPBD1@Z could not be located in the dynamic link library irrKlang.dll.

And it exits after pressing OK.

You need to check if irrKlang is the right version. DLL exports may change, either in name or format between versions. You might need to dig a bit to find the right version. Try the one from WoG.

If it was me, I would replace irrKlang with some other library, such as FMOD or BASS (after changing all the imports to the new library).

I already replaced irrKlang with SDL for the Linux port. That would work on Windows too.

Too bad I'm not allowed to release the code.