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What is the specific error you see, which executable did you run, and what platform are you targeting?
I ran QuartusSetup-13.1.3.178.exe to install over 13.1 (build 162) on Windows7 and this updated Quartus & DSP Builder Advanced to build 178. There were no changes to DSP Builder Standard so this remains unchanged from the 13.1 install as build 162.
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I do not remember exactly the error message but it had to do with the fact that I already updated Quartus to 13.1.2 before trying to install the DSP Builder.
The error message was that the DSP Builder installer build 13.1.0 cannot install DSP Builder over Quartus 13.1.2.
I change the version.txt file inside quartus folder to show that the version of Quartus is the old version and then i run the DSP Builder installer again and it did it.
I reverted the version.txt to the original after that. I hope that this change doesnt act as a timebomb later.
What I could do now would be to run the quartus update installer again in case it also updates the DSP builder installation.