private String downloadFile(String owner, String region, String subregion, ModelMap modelMap, HttpServletRequest request) {
		PackageDownloadInfo packageDownloadInfo = PackageDownloadInfo.builder().owner(owner).region(region).subregion(subregion).build();
		return downloadFile(packageDownloadInfo, modelMap, request);
	}
Download the latest agent.

@param packageDownloadInfo information for downloading agent.
@param request request.
ngrinder-controller/src/main/java/org/ngrinder/agent/controller/AgentDownloadController.java