Here's FamilySearch's statement:
"Currently we are not able to export data from Family Tree to a GEDCOM file. Use one of the Family Tree certified programs, i.e. Ancestral Quest, Legacy Family Tree, or RootsMagic to import data from Family Tree into one of the programs and then create a GEDCOM."
First, you'll need to download a free version of RootsMagic.
At rootsmagic.com and in the header menu, select Downloads, then select Trial Vers…