During primary site or secondary site installation, the Configuration Manager Setup Wizard will prompt you to download the prerequisite components that must be installed on computers prior to running Configuration Manager client setup (CCMSetup.exe) on them to install the client. There are around 88 client prerequisite files (a little over 83MB) that are required for Setup to continue. The first file to be downloaded is called ConfigMgr.Manifest.cab which contains the .xml manifest file (ConfigMgr.manifest.xml) that lists the individual component files and where they are to be downloaded from. The files being downloaded include: Microsoft Remote Differential Compression Library (msrdcoob.exe in AMD64, IA64, and x86 versions), Windows Update Agent 3.0 (x86, x64 and IA64 versions), and BITS 2.0 and BITS 2.5 (in all supported client languages), and a WMI update for Windows 2000 computers. During the download process, you can see the files being downloaded, and where they're being downloaded from, by watching the ConfigMgrSetup.log log file. When you install a management point site system, the downloaded client installation prerequisite component files are transferred from the site server to the new management point to enable client installation processes to succeed.
Note: I've described how to see the files that are downloaded just so you'd know how to see what is being downloaded. It's really not recommended to go and try to do it all manually. Do you really want to go to almost 90 different links and do it manually anyway?!
There are two setup wizard pages used for downloading prerequisite client installation files: The Updated Prerequisite Components page and the Updated Prerequisite Component Path page:
The Updated Prerequisite Components page of the Configuration Manager Setup Wizard offers you two choices for obtaining client prerequisite files. You can either check for updates and download the newest prerequisite component files directly from Microsoft using the Internet or, if you have already downloaded the files to an alternate location, you can select the option to specify an alternate location to obtain the prerequisite component files.
Tip: Even though you can use the same alternate source location for multiple Configuration Manager installations, if it has been a while since you downloaded them last, you should always download the latest available components in case the files have been updated since you last downloaded them.
The Updated Prerequisite Component Path page of the Configuration Manager Setup Wizard is used to specify the path to store or access the downloaded client installation prerequisite component files. If you chose to download the files from the Internet, the downloaded client installation prerequisite files are stored in the path specified. If you chose to specify an alternate location for the prerequisite files, enter the path to where you have stored the downloaded files on this page.
If your site server computer does not have Internet connectivity, you'll need to download the client installation prerequisite files and use the alternate location option. To download the files from a different computer, just start Configuration Manager Setup on a computer with Internet connectivity and use the following command: Setup /download <path to store files>. After the download has completed, ensure that the site server computer can access the downloaded prerequisite files and use the alternate location during site server installation. In some cases, you may need to store the downloaded files on a removable media to transfer to the site server computer itself.
Important An additional step may be required in this process when performing push installations of secondary sites. Because the secondary site installation wizard does not contain the client prerequisite component download pages, you may have to place the files in a hard coded location. When using installation media at the secondary site computer to install the secondary site using the wizard (Install the source files from the local disk or removable media at the secondary site server option) you must create a subfolder called Redist under the SMSSetup directory in the installation source files and save the downloaded files there. If you select the option to push the source files over the network to install the secondary site (Copy installation source files over the network from the parent site server option) this step is not necessary.