no other message. I tried fiddling around and moving different files one time it seemed the emulator locale was wrong. not sure how to check where it installs with it...
In theory, the installation already comes with a version of 8bit-Unity.
From the error message, it seems that the error already happens at the compilation step.
Try to press <ctrl> + <shift> + I on the editor's window to open the developer console; it probably should show more details on what's happening.
I see, it seems that the tool isn't finding the "xcopy" program for some reason.
I have opened an issue on the repository so I can take a look at it later:
https://github.com/haroldo-ok/BlocklyVN8bit/issues/54
Maybe this workaround could fix it until then:
https://stackoverflow.com/questions/25500650/batch-file-error-xcopy-is-not-recog...