Yup having the same issue. I tried modifiying the permissions to the folder like someone else suggested and I stopped getting the could not write to ini file but it still doesnt update the dat.
Starting task: AutoUpdate
Checking update packages from repository NAIHttp.
Initializing update...
Verifying catalog.z.
Extracting catalog.z.
Loading update configuration from: catalog.xml
These updates will be applied if they are in the repository: Engine, DAT, VSCANCEU1000, EXTRADAT1000, BOCVSE__1000, VIRUSCAN8700.
Downloading PkgCatalog.z.
Verifying PkgCatalog.z.
The requested file does not exist
Where can I find the repository to clear it out?