There could be multiple reasons that led to this error. First of all, try re-installing the software and make sure there are no other applications running in the background. Secondly, check the configuration settings because it's possible that the software is configured in a way that isn't compatible with your operating system. The best bet in this case is to simply reinstall it and it should work. There is no possibility to download the application again because the website isn't available for this operation.