here is the sequence of commands I used in Windows 10 to get the Inkscape version number, assuming that I start at the location you are at:
C:\Users\brynn>cd\
C:>cd program files (x86)
C:\Program Files (x86)>cd inkscape
C:\Program Files (x86)\Inkscape>inkscape -V Inkscape 0.92.3 (2405546, 2018-03-11)
C:\Program Files (x86)\Inkscape>inkscape
C:\Program Files (x86)\Inkscape> .................................................................
after each command you will see the prompt change to tell you what directory you are currently in. If the prompt does not change then the command has failed. I prefer to break the thing up into multiple steps so that you can see that each step has succeeded before attempting the next step. Your final directory may change depending on which version you installed. You will need to confirm the exact location of the Inkscape file by using Windows explorer to find Inkscape.exe
-- Sent from: http://inkscape.13.x6.nabble.com/Inkscape-User-f2857977.html