I just had the “pleasure” of installing SP2010 on a customers offline network. Apparently most prerequisites are downloaded on the fly which result in great troubles when out SharePoint servers aren’t connected to the outside world.
After having manually installed a few prerequisites I discovered this great article contained direct download links to all prerequisites. Thanks Dave!
Note that the 2 prerequisites regarding speech may just open the installer and disappear again but they perform their job anyway. At least as far as SharePoint are concerned. Also note that the Analysis Services ADOMS.NET comes in a version for both SQL Server 2008 and SQL Server 2008R2. I tried using the R2 version because my SQL Server is R2. However the prerequisites installer will only recognise installing the NOT R2 version – didn’t dvelve too much into that.