It looks like ILSpy is decompiling slightly different for a few of you. Until we know why, here is a temporary fix that you can try.
- Select CAW in ILSpy and Save Code again to a new folder
- Start TortoiseMerge
- Apply ilspy_difference.patch (from the attached zip file) as a unified diff to your project folder
- Now apply the original patch linked from the tutorial and continue normally