Hopefully, y'all have found this solution by now, but...
Using the latest version of the program, open LiveUpdate and click on the
Options drop down in the UL corner. Choose
Configuration, then the
Update Cache tab. My default setting for the cache was 1,900 MB, i.e., 1.9GB, which I have reset to considerably less. You can adjust it to a size suitable for your system or remove all update files from cache with the button near the bottom of the window. The window also tells you how much is in cache, if you are interested.
Hope that helps.