[Agda] installing agda

[Patricia Peratto]

I have installed the following software: 

ghc version 8.6.5 
cabal version 2.4.1.0 
emacs for windows 27.1 

When I execute cabal update it finishes. 
I have executed cabal install Agda many times. 

the last time has answered: 

Starting Agda-2.6.1.2 
Building Agda-2.6.1.2 

and lasts hours without finishing. 

I'm missing some step in the installation? 

Regards, 
Patricia 
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