Trying to install a selection of IIS Windows features via dism:
dism /NoRestart /ONLINE /Enable-Feature /All /FeatureName:IIS -ASPNET /FeatureName:IIS-NetFxExtensibility /FeatureName:WCF-HTTP-Activation
gives the error
The source files could not be downloaded. Use the "source" option to specify the location of the files that are required t o restore the feature. For more information on specifying a source location, see http://go.microsoft.com/fwlink/?LinkId=243077.
The DISM log file can be found at C:\WINDOWS\Logs\DISM\dism.log