Installation problem of Ladybug tools 1.2.0 in Rhino6 win

Hi, I encountered installation problem of Ladybug tools 1.2.0. When I run STEP1, I received the message as below:

  1. Ladybug Tools installation folder already exists at:
    C:\Users\nikko ho\ladybug_tools

  2. Runtime error (Exception): File is not a zip file

Traceback:
line 811, in _RealGetContents, “C:\Program Files\Rhino 6\Plug-ins\IronPython\Lib\zipfile.py”
line 770, in init, “C:\Program Files\Rhino 6\Plug-ins\IronPython\Lib\zipfile.py”
line 85, in unzip_file, “”
line 128, in script

How I solve this problem? Thanks a lot!

Try deleting the folder at C:\Users\nikko ho\ladybug_tools and then re-run the installer.gh