For installation there is a video created on the expedition forums demonstrating how to perform this function, you can watch the video here ( https://live.paloaltonetworks.com/t5/expedition-migration-tool/ct-p/migration_tool ), also there are guides listed from that link as well.
As for the Cisco FirewPower migration the expedition tool will not migrate over the layer 7 policies but only the layer 3/4 policies so you will need to export the configuration with the asa format for conversion.
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