Even before Edison was born, scientists had experimented with making light bulbs. These bulbs burned out after a few minutes. What Edison invented was the first incandescent light that was practical, that would light for hours and hours. He and his muckers also had to invent hundreds of other parts to make the light bulbs in your home work. Light switches, electric meters, wiring--all these had to be invented too.
The pip command is a tool for installing and managing Python packages, such as those found in the Python Package Index. It's a replacement for easy_install.
I get the same exact error when using the installer. So just ignore the installer and go with a manual install and all should be good. Manual installing works every time for me. I mostly use that error to wipe my harddrive for me then I continue up with a manual install of cloudready os. Edit: Here's a link to manually install https://neverware.zendesk.com/hc/en-us/articles/213131287-Manual-Installation-Via-the-Cmd-Line. So just ignore the error and go with the manual install.