If you want to install the Nimble Connection Manager for Windows silently, you will need to specify a couple of options at the command line:
Setup-NimbleNWT-x64.2.2.3.432.exe /S /v/qb- INSTALLDIR=\""C:\Program Files\Nimble Storage\"" NLOGSDIR=\""C:\Program Files\Nimble Storage\Logs\"" /norestart
The important section is the NLOGSDIR. If this option is not specified then you will get a MSIEXEC Error 1606: Could not access network location 0. I chose to specify the INSTALLDIR as well so that I knew exactly where everything was going.