Update artifact download URL

components/application-mgt/org.wso2.carbon.device.application.mgt.core/src/main/java/org/wso2/carbon/device/application/mgt/core/impl/ApplicationManagerImpl.java

@@ -2870,7 +2870,8 @@ public class ApplicationManagerImpl implements ApplicationManager {
             }
             ApplicationReleaseDTO applicationReleaseDTO = applicationDTO.getApplicationReleaseDTOs().get(0);
             String artifactDownloadURL = APIUtil.getArtifactDownloadBaseURL() + applicationReleaseDTO.getUuid()
-                    + Constants.FORWARD_SLASH + applicationReleaseDTO.getInstallerName();
+                    + Constants.FORWARD_SLASH + Constants.APP_ARTIFACT + Constants.FORWARD_SLASH +
+                                         applicationReleaseDTO.getInstallerName();
             String plistContent = "<!DOCTYPE plist PUBLIC "-//Apple//DTDPLIST1.0//EN" "" +
                                   "http://www.apple.com/DTDs/PropertyList-1.0.dtd"><plist version="" +
                                   "1.0"><dict><key>items</key><array><dict><" +