Rearm office 2013 before capture image is not working- 'ospprearm.exe' is not recognized as an internal or external command

Hi

We have a KMS server in our network.
I have installed Windows7 and Office 2013  and have installed all the Microsoft updates.
The below article says that I have to rearm office 2013 before, I capture an image of this PC. I am planning  to push the captured image to 30 PCs in the network.

https://technet.microsoft.com/en-gb/library/dn385362.aspx

When I run the CMD as administrator to rearm, it says

C:\Users\Administrator>cd c:\
c:\>cd program files
c:\Program Files>cd microsoft office
c:\Program Files\Microsoft Office>cd office15
c:\Program Files\Microsoft Office\Office15>
c:\Program Files\Microsoft Office\Office15>ospprearm.exe
'ospprearm.exe' is not recognized as an internal or external command,operable program or batch file.

c:\Program Files\Microsoft Office\Office15>

Please let me know if I am missing something. Any help would be grateful.
Thanks