Can't Install WebEssentials2013.5

[wallsr]

Have VS 2013 Pro update 5
Trying to install Web Essentials 2013.5
Get error about access denied:
3:36:05 PM - Install Error : System.UnauthorizedAccessException: Access to the path 'C:\Users\xxx\AppData\Local\Microsoft\VisualStudio\12.0\Extensions\cv41d5qj.lkh\Resources\nodejs\tools\node_modules\core-js\library\modules$.html.js' is denied. at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
Since it appears to be looking for nodejs, I tried installing the nodejs VS tools and tried using the link to actually install nodejs. The Tools installed, but the links to node js in the dialog didn't work, so AFAIK I don't have nodejs installed. Not sure that matters, because I didn't see that anywhere as a requirement.
I've tried installing web essentials as admin and as regular user with same error message.
After installing the nodejs tools the folder mentioned in the error actually does exists now, but not the file $.html.js.
At that point WebEssentials was installed??? but disabled. I enabled it and restarted VS, but can't find any hint of webessentials actually being installed except in the extensions dialogs (nothing in Tools->Options or anywhere else that I can find.
So, what am I missing?