It’s strange because i’ve just opened one of the Demos, then from the “settings – > activate” the system had told me that LIBPF was active, i repeat the same method of before but the answer by the terminal is always the same :
LIBPF is not yet activated on this computer.
Please launch the libpf_activation application to perform the automatic, online activation.
I’m trying to send you an image but the size is too big, i’ve send the screenshot on your e-mail.