esxcli: Update/patch produces “Could not download from depot” error

In ESXi 5.1 you can patch using the following command:  
esxcli software vib install -d /path/to/
  If you’re getting the following result (using as an example):  
 [MetadataDownloadError] Could not download from depot at zip:/var/log/vmware/, skipping ((‘zip:/var/log/vmware/’, ”, “Error extracting index.xml from /var/log/vmware/ [Errno 2] No such file or directory: ‘/var/log/vmware/'”)) url = zip:/var/log/vmware/ Please refer to the log file for more details.
  This results from not putting in the absolute path to the .zip – e.g. using:  
esxcli software vib install -d  
rather than:  
esxcli software vib install -d /vmfs/volumes/datastore/
  Putting in the full path to the .zip file should resolve that error.