Hello,
if you want to reuse the same files, the folder must be called "Allods Online FR" (you can rename it if not), and specify this folder as installation folder. The new launcher will redownload most of the files.
But anyway, I recommand to redownload everything from scratch in a new fresh folder. Just keep a backup of the old "Personnal" and "Addons" folders (but make sure that all your addons are up-to-date).