After Lightroom 6 si installed (which is in fact Lightroom CC 2015 if you open and check the freshly installed version), DO NOT open Lightroom because this will only lead to the “Can’t connect” problem (searching for the offline activation feature which Adobe provides requires a Response Code for the installer which is not available anywhere).Just ignore the error message for now and install anyway by pressing the “ask later” button.But after you provided all that information, you will get an error message saying: “Can’t connect to the Internet, check Internet settings” (or something similar). The installer wants you to login with your Adobe credentials and provide your Lightroom 6 Serial Number.
If you install the last stand-alone version of Adobe Lightroom version 6.14 on a newly installed Mojave macOS you will encounter a new problem ( see this post from 2020) – here is how to solve it:
