https://github.com/o2platform/O2.Platform.Scripts/blob/56cb145f4f710e3fcc4462789b7a3814a613912c/3rdParty/ILSpy/ILSpy_Installer.cs#L20 should go to https://github.com/icsharpcode/ILSpy/releases/download/2.2/ILSpy_2.2.0.1706_Binaries.zip as per http://ilspy.net/