Sorry to say that I get the same error with that link as well. It says software installed, but I still don't have the desktop app. It gives me Vive Home and Vive Dashboard.
I cannot install the desktop app. I run the ViveSw.exe file but mid install I get a message saying it cannot find the installation package for Setup_VivePCClient.msi.
I also received this same error when running the ViveSetup.exe
Windows 10