How to install Octave packages?

[WMDhamnekar]

Hello,
   
    I have a Octave version 5.1.0. installed on my laptop. I want to install
financial, statistics,io octave packages which i have already downloaded. 

I could not install these packages because octave showed error. Octave
showed error because installation of these packages depends upon other
package installation.

 Now how can i install all these packages in my octave? 

Note: statistics  version $\geq 1.4.0$and io version $\geq  2.4.11$. Latex
is not working here.



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