No, there is no version of GTS Pressworks capable and compatible with Windows 7 and 8. The official website doesn't offer any information at all. In this case you can test it for compatibility issues. If you still have the package, right click it and select Troubleshoot Compatibility. Use the suggested Windows versions from the list and then attempt a launch. If it works, proceed with the installation and save the settings. In either case, the software is lacking compatibility, therefore it can't be installed in Windows 7 or Windows 8.