Step 1- Download IDM.
Step 2- In the software click on OPTIONS.
Step 3-Click on the connection tab.
Step 4-Click on the dropdown menu of "Connection Type/Speed", and select the last one
Step 5-Click on the dropdown manu of "Default max. conn. number", and select '24'.

NOTE: IT CAN DOWNLOAD A 6gb FILE IN 2 TO 3 HOURS!!!!!