Most small offices suffer from unreliable or metered internet connections. If you have 15 workstations, using a standard 2MB online installer for each machine would mean downloading 30MB of data—but that is just the installer , not the definitions . The online installer downloads the full virus databases (often 200-500MB per machine) in real time. This clogs your network.
For specific versions (like file server offline installers), Kaspersky recommends contacting Technical Support to receive a direct link to the full standalone package. kaspersky small office security download offline installer