After removing LR6, logging in to CC and providing the license key, the installer tells me that LR6 is not compatible with Vista and I cannot proceed. The problem is that I am not running Vista but Windows 7.
This is a complete shot-in-the-dark, but internally all releases of Windows have version numbers of "
NT N.N," where the two
Ns represent a major version number and a minor version number. Windows
Vista was NT 6.0.
Windows 7 was NT 6.1.
Windows 8 and
Windows 8.1 were NT 6.2 and 6.3, respectively. Finally, with the release of
Windows 10, Microsoft bumped the major version number up to 10, to match the marketing name.
My conjecture is that the installer is only checking the major version number. As I say, it's just a guess, but if I'm correct it's an installer bug and you're probably going to need assistance from Adobe customer support to find a workaround.