I recently downloaded the xlsxwriter version 0.6.4 and installed it on my computer. It correctly added it to my C:\\Python27\\Lib\\site-packages\\xlsxwri
I installed it by using a wheel file that can be found at this location: https://pypi.org/project/XlsxWriter/#files
I then ran pip install "XlsxWriter-1.2.8-py2.py3-none-any.whl"
Processing ./XlsxWriter-1.2.8-py2.py3-none-any.whl
Installing collected packages: XlsxWriter
Successfully installed XlsxWriter-1.2.8