Rekordbox not updating

Hi, I'm running rekordbox on my pc, it's version 4.5.0 but the update manager says that there is not a more current version.  My computer is within the system requirements and the software is up to date, was wondering if there is anything I can do about this as I wanted to upgrade to 5.  I've tried deleting the program and redownloading it with no luck, 

thanks