SetDirectory["C:\\drorbn\\AcademicPensieve\\People\\ThurstonD"]

Fetch[f_] := Module[{dbf=FileNameJoin[{"C:\\Users\\Dror\\Dropbox\\People\\ThurstonD", f}]},
If[FileType[dbf]=!=None,
If[FileType[f]=!=None∧FileDate[f]<FileDate[dbf], DeleteFile[f]];
If[FileType[f]===None, (
Print["People/ThunstonD: Fetching ",f,"..."];
CopyFile[dbf,f]
)]
]
]

Fetch /@ {"Agenda.tex", "Agenda.pdf"}

{}