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Some Mac users who have Stuffit Expander installed may find that when opening a .air file, the Stuffit Expander software runs, and installation does not complete successfully.
This is because Stuffit Expander sees the MarketSamurai.x.xx.air file, sees it ends with ".air", and believes it should be the one to open the .air file.
To get around this issue, drag the Stuffit Expander application into the trash before double-clicking on the .air file to install or execute an upgrade.
Once you have finished, you can drag the Stuffit Expander application out of the trash, and back into the applications folder.