CIS antivirus keeps updating same definition

I have downloaded latest version of CIS as a new install. The program started initial a/v update and installed. Over the past hour it keeps updated the same file 4 times, and at 91.4 MB is fast eating up my bandwidth! What is the cause and is there a fix…my previous a/v (Avast) had no prob;ems and when I uninstalled it did a cleanup with a removal tool. :-\

Boot in Windows Safe Mode and rename the bases.cav in the Scanners folder of the CIS installation folder. Then boot to Windows and try again.

Or try the procedure in Where can i download the latest full AV database?.