I don't know what "nada" means, but I presume you mean that the program isn't working correctly
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I suspect that you haven't installed it correctly. You need to first of all run the "Book Designer 4" installer (it's a proper ".msi" installer) then, once BD4 is installed, get the current BD5 upgrade and unzip that on top of the BD4 installation folder, overwriting all the files with the same names. Everything should then be OK.