Installing Autoprefixer

I’m not sure if this is the right forum, but Autofixer is a js based plug-in.
Anyone know how to install Autoprefixer? I have downloaded the windows 64 bit installer (node-v5.6.0-x64.msi) but when I run it I get a message:
The feature you are trying to use is on a CD-ROM or other removable disc that is not available.
I do not have a CD-ROM and the file is not on my backdisc.
Can anyone help?

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