I keep getting reminders that an update is available for LR5. but cannot download it. It just keeps downloading the same installation file, not an updated file.
Which version of Lightroom are you running (5.6 is the latest)?
What is the name of the file that is being downloaded?
installed version is 5.4
and it keeps downloading the original installation file for 5.4 even though I follow the update link.
The latest version is 5.6. Try to download and install the latest version, it might solve your problem.