"Prepare Form" tool is not available in an existing fillable form--only "Create Form"

I'm using Adobe Acrobat DC Pro on a fillable form I previously created. When I reopened the form yesterday to work on it, it is functioning properly (fields are fillable, drop downs are able to be selected, pages are spawning, etc.), but when I go to edit the form only "Create Form" is available from the toolbox. The "Prepare Form" tool is not available. I tried opening other fillable forms as well and the same issue ("Create" instead of "Prepare"). I tried another computer and the "Prepare Form" tool is available for these forms. Do I need to uninstall/reinstall the program on my computer? If so, how do I do that? Is this a common glitch? Are there any other fixes? 

Any help would be greatly appreciated!

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