That is most likely the result of a problem we had with the python utilities setup, which we changed already (so this will be available with the next release). For now your best option is to comment out/remove the part where the script prints tries to build the python utilities.
Look in the script for the line which reads:
echo Building mysql_utilities files ...
then remove/comment out the entire block until the lines (inclusive)
rem rmdir /s /q %TOP_SRC_DIR%\ext\utils_build
cd ..\..\..
Mike
Mike Lischke, MySQL Developer Tools
Oracle Corporation
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