To do this, you can pay a visit to the Yamaha Download Website to get the latest version of the software you want to download.
Remember that you have to check the operating requirements to ensure that it can function properly after downloading the software.
Moreover, to help you download the software for THR5 easily, Yamaha has published the updated THR's manual or the help guide, which can be found on Yamaha's official website.
In these files, you can access all the information about each of the THR model's installation.