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I just installed SageMath-8.1.app on MacBook Touchbar OSX 10.12.6. I wanted the ClusterAlgebra/Quiver package. The 2011 manual ("Compendium") says to first install the combinatorics package "combinat " by entering "./sage -combinat install". I did that on the terminal command line in various subdirectories of SageMath-8.1.app but got only error messages. I then tried "./sage -i combinat" which produced much output with the upshot that it couldn't find combinat. "./sage package list" showed neither combinat nor anything sounding like "cluster". I will appreciate suggestions. ---If this is not the right forum for this question, please advise where to go. Thanks.