The most reliable source is the official Olivetti Support portal.
: The primary source for "verified" drivers is the Olivetti Official Downloads Page. Look for the "d-Copia 5001MF" in the monochrome multifunctional category. olivetti dcopia 5001mf driver verified
driver package is approximately 66 MB and uses the oemsetup.inf file for manual installation. The most reliable source is the official Olivetti