static int dm_sendFileToOtherMachine_chunkSize = 100*1024; // 1024*1024;

please include function dm_sendFileToOtherMachine. // for chunkSize

svoid dm_retrieveFileFromOtherMachine(S computerID, S remotePath, File f) {
  backupFile(f);
  
  long size = toLong(dm_evalOnOtherMachine("fileSize( + quote(remotePath) + ")");
  
  for (LongRange r : chunks(size, dm_sendFileToOtherMachine_chunkSize)) {
    print("Retrieving file chunk " + r + " of " + computerID + ":" + remotePath + " to " + f);
    byte[] chunk = dm_evalOnOtherMachine(computerID, "loadBinaryFileChunk_base64(" + quote(remotePath) + ", " + r.start + "L, " + r.end + "L" + r.length() + ")");
    saveBinaryFilePart(f, r.start, chunk);
  }
  
  truncateFile(f, size);
  print("File retrieved: " + f);
}