Dear valid,
You are having this evaluation message because you are not setting the license of Aspose.Metafiles and only setting the license of Aspose.Slides.
lic=new com.aspose.slides.License();
lic.setLicense(new FileInputStream("d:\\downloads\\Aspose Custom.lic"));
metalic=new com.aspose.metafiles.License();
metalic.setLicense(new FileInputStream("d:\\downloads\\Aspose Custom.lic"));
Many Thanks and Kind Regards,
Shakeel Faiz
Support Engineer
Aspose Tyumen Team