Hello Sohail...I think you need to get the Artist version of Studio One to be able to use 3rd party VST plugin to work in Studio One. Now it costs 100 bucks and Artist version in new 5 allows for 3rd party plugins (before with version 4 that was only possible with the PRO version (400 bucks!). I just bought that even though it does not work on my PC, I just emailed Presonus asking for help.... Grrrrrr