Many users who have attempted to download SolidWorks 2012 SP3 have run into an error message: "Could not connect to the SolidWorks server to determine which products you are entitled to." This is a know issue and is not a problem with your licensing. First, verify that you have a working internet connection. If you have verified that everything is working, it is likely that Solidworks is experiencing a high volume of traffic on the download servers. Simply try the download again at a later time. If you are still experiencing problems you can contact tech support for additional troubleshooting steps.