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Unzip the archive and put the resulting Operators directory in your Flexsim4/libraries/ folder.
In Flexsim, go to View>Library Icon Grid to open the Flexsim Library window. From the Library window, go to File>Load Libraries... and choose Operators.fsl from Flexsim4/libraries/Operators/.
You will now see a new library opened in the Library window consisting of various operator types.
For Flexsim version 5+, you will need to select the option "Draw Walking Operator" in the Custom Draw Code trigger on each operator in order to animate their walking.