When you try to install the .NET Framework 4.6.1 on Azure Cloud Service virtual machines, the installer may fail with a "disk full" error ([HRESULT = 0x80070070 - ERROR_DISK_FULL]).
The .NET framework 4.6.1 installer now uses the %TEMP% folder to extract and install files. The %TEMP% environment on Azure Cloud Service Virtual Machines is limited to 100 MB, and this causes the installer to fail with the "disk full" error.
To work around this issue, define a local resource for your Azure cloud service that reserves at least 1 GB of space, and then redirect the %TEMP% folder to this local resource.
For more information, see Install the .NET Framework on a Cloud Service role.