I have a trial copy of indesign cc installed on the user machine but did not allow me to activate with the CS6 license that i had bought and i do not have access to the LWS that was used to purchase the license.
If you are a Volume licensing customer then you may download the product from the Adobe Licensing Website. In case you do not have access to it you may even try the direct download: http://prodesigntools.com/adobe-cs6-direct-download-links.html.
Kindly follow the very important instructions before download.
Once download enter the serial key at the time of installation to activate the product.