I am having problems with installing the update 5.6 of Lightroom from 5.2.
I downloaded and ran the updater. It has uninstalled my previous version of Lightroom but now each time I try to run the installer it fails, with the message "key not valid for use in specified state".
I have tried restarting to no avail.
Searching Google for the error and Lightroom, the two forum threads that come up are:
1) Installing Muse the user wasn’t logged in as an administrator level user and after they logged in as an administrator user and did the install, again, it worked.
2) A recent Windows Update seemed to interfere with something and the user did a system restore back to a few weeks, ago, reinstalled their previous version of LR, and then installed LR 5.6 and then did the Windows Updates again and everything was ok.