Xiste, Ceciliabr, maybe High Sierra does not accept to change Info.plist anymore. Strange that it worked on my side...

Yes, that is indeed very strange. I have tried both ways of editing the info.plist on several machines, and I get the same error.
This obviously has nothing to do with OSX, since I still have no problems editing the info.plist in v 5.0 without getting any error message.
Maybe some security measures have been included in the newer versions of SH3D, something that's preventing any attempt to alter the original?


cec