The other day I built a Virtual Machine to test errors I experienced in Outlook 2010. I applied the latest Windows Updates to the Virtual Machine however when I was prompted to update .NET 4.5.2 (KB2901983) I received the error code 13EC.
To resolve the Windows Update error code 13EC for KB2901983 I had to expand the virtual drive. My Virtual Machine had roughly 2 GB free prior to applying the update so I expanded the virtual disk by 5 GB and the update applied successfully.
If you have a physical machine then the issue is likely your C drive (operating system drive) is either full or to small.
Microsoft answers.microsoft.com has a related post: click here.