In order to Synchronize Manufacturers, you must first perform the LiveUpdate which is accessible in the Downloads section for the Stardraw Application you are running from http://www.stardraw.com
Once the LiveUpdate is complete, there will appear 2 links - one to Synchronize Manufacturers and one to Run the application now.
If for some reason the links don't appear, you could click on the following relevant links:
Stardraw A/V Synchronize Manufacturers
Stardraw Audio Synchronize Manufacturers
These links go directly to the Synchronize Manufacturers pages and bypass the LiveUpdate pages. Note that you must ensure that you perform the LiveUpdate successfully each time before you Synchronize Manufacturers.