You can use the Update Manager Download Service to download updates and then copy and paste the updates to the VMware Update Manager repository.
To download the patches, run this command from the command-line:
vmware-umds --download
To download updates for a particular release between a two specific dates, run this command:
vmware-umds --re-download -start-time <start_date_time> --end-time <end_date_time>
For example:
vmware-umds --re-download -start-time 2008-05-01T00:00:00 --end-time 2008-05-31T23:59:59
After the patches are downloaded, copy them to your repository. By default, the repository is located at C:\Documents and Settings\All Users\Application Data\VMware\VMware Update Manager\Data\ .