Unable to install a downloaded zip package in octave

[suneha]

I am a complete beginner for octave. 
I have installed octave 4.2.1 in Windows 7.

I want to install a package(GLCM_Features4) that I have downloaded from this
link:
https://in.mathworks.com/matlabcentral/fileexchange/22187-glcm-texture-features

It is a zip file. 
I tried : >> pkg install GLCM_Features4
But I got the following error message:
unpack: FILETYPE must be "gunzip" for a directory
error: called from
    unpack at line 122 column 7
    untar at line 47 column 5
    install at line 81 column 9
    pkg at line 394 column 9

I have tried googling it. I couldn't find an answer anywhere.
Can anyone help me out here?
Thanks in advance



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