Extend Office 2013 trial to 180 days

In the command prompt:

Go To:

 C:\Program Files\Common Files\Microsoft Shared\

or to (in case of 64 bit)

 C:\Program Files (x86)\Common Files\Microsoft Shared\

or

c:\Program Files\Microsoft Ofice\Office15


Then run OSPPREARM.EXE

http://www.howtogeek.com/148347/how-to-extend-your-office-2013365-trial-to-180-days/