Unable to update Mac OS 10.7.5
Make sure that your have downloaded the correct combo updater:


OS X Server should have the 10.7.5 Server Combo updater = DL1585 ≈ 1.99 GB
OS X Client should have the 10.7.5 Client Combo updater = DL1582 ≈ 1.91 GB




To determine whether the client or server version is installed on your Mac, use the Terminal command: $ /usr/bin/sw_vers

Example output for 10.7.5 Server:

ProductName:    Mac OS X Server
ProductVersion: 10.7.5
BuildVersion:   11G63