limit Number of bytes which need to be downloaded starting from the "offset" position before the download will automatically be canceled; use 0 to download without a limit
priority Priority of the download (1-32). The higher the priority, the earlier the file will be downloaded. If the priorities of two files are equal, then the last one for which downloadFile/addFileToDownloads was called will be downloaded first
synchronous Pass true to return response only after the file download has succeeded, has failed, has been canceled, or a new downloadFile request with different offset/limit parameters was sent; pass false to return file state immediately, just after the download has been started