In English:

To upgrade a previously installed version of ELF, simply overwrite the old
versions of ELF.EXE and ELFHLP.HLP with the new ones.

In Italian:

Per aggiornare una versione gia' installata di ELF, copia semplicemente
ELF.EXE e ELFHLP.HLP nuovi su quelli vecchi.

Elfred