Next, double click and install the drivers. The download is a zip file. Look inside the zip and you’ll see this:
The file you want to launch is probably the one ending _x64.exe ← launch this, and follow the prompts:
The guidance pdf “how to upgrade legacy streamers to 4.8” is in freshdesk here https://naim.freshdesk.com/en/support/solutions/folders/33000214498
There’s a YouTube video that shows an upgrade to a superuniti in the following thread: