# Installing Clients with Deprecated Operating Systems or Applications on UNIX Computers

You can install clients with deprecated operating systems or applications on UNIX computers.

## Before You Begin

Add the nAllowOlderClients additional setting to the CommServe computer as shown in the following table, and then restart all Commvault services on the CommServe computer. This additional setting allows older clients to communicate with the V11 CommServe computer during installation.

For information about adding an additional setting from the CommCell Console, see Adding an Additional Setting from the CommCell Console.

Additional setting | Category | Type | Value
--- | --- | --- | ---
nAllowOlderClients | Session | Integer | 1: Enable 0 (Default): Disable

## Procedure

From the installation package or mount point, run the following command and follow the installation wizard:

    ./cvpkgadd -allow-newer-commserve

Note: If you plan to install Commvault Version 9, you can also create a custom package and use the XML file to install the package silently. In the XML file, you must update the value of the `allowNewerCommServe` parameter to 1.

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