I have got LR5.0 with the system camera samsung nx30. Update to LR5.7 is failure, because there is an missing programm. But the program does not say, what programm is missed.
Can you try to uninstall the current 5.0 version and reinstall the 5.7 package?
Please, first note down the serial number.
Try downloading LR 5.7.1 from this link:
Retrieving data ...