this year I changed my system from Windows to imac 10.10.3
Enter Download Lightroom 5.3 licensing scheme code everything O.K.
Then error message "could not go to a specific module".
Update window opens 5.7. When one says install does nothing, as in install. Lightroom is.
many thanks for the help ....
I'm not sure I did understand the issue.
Chnanging Modules Error: https://helpx.adobe.com/lightroom/kb/error-changing-modules-lightroom.html
Download LR manually: https://helpx.adobe.com/lightroom/kb/lightroom-downloads.html
the problem is solved.
In library folders - set the write permissions in Lightroom folder. Library Folders on Mac. Finder go to Librarys (Alt-Button hold)
Then the error message, can not in module no more substitutes.