1. Press Windows Logo button+R (run)

2. Type gpedit.msc and press enter.

3. Double Click Administrative Templates.

4. Then Network

5. Then Double click Qos Packet Scheduler

6. Now a new list will appear. From that click on Limit reservable Bandwidth

7. Click on Disable (radio button)

8. Click Apply button

9. Now restart your computer,, hurray you're done

Use IDM to boost your download speed.