Changes

  #!/bin/bash

  #!/bin/bash

  cd ~/Downloads/VoiceBlast/

  cd ~/Downloads/VoiceBlast/ && sudo ./VBlast4.py

sudo ./VBlast4.py

Now go to the file location and right click on it to select Properties. Click on Permissions tab and tick the "Allow executing file as program" checkbox.  

Now go to the file location and right click on it to select Properties. Click on Permissions tab and tick the "Allow executing file as program" checkbox.