Support is obviously no longer available for LR 6, so I'm a bit stuffed. I had standalone version 6.14 prior to a system crash. Unfortunately I lost most of my software which I have had to reinstall. In most cases it's not an issue, until it comes to this! I am up and running with version 6, but I had 6.14 prior and I would like it again. Considering I had paid for it, I believe I am entitled to it.
I believe that link is for the the free trial of subscription version (Lightroom CC 2015.14). If after installing it doesn't find your previous LR 6.14 license key, you'll need to "serialize" that free trial by entering your license key. See here for details: