Tray 5 can't not be installed
Grayed out on a Fiery has never meant it is not available, it means it is a conflict, and by selecting the Tray 5 that is greyed out it will tell you why, and in most cases, also fix the conflict. So do that, and if still an issue, give us a description of the error as well as screenshots.
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for posts that resolve your issues. Your feedback counts!Joe Arseneau