Hi jatin ,
We updated the Elementor popup method so that users won't have to install a third party plugin to use it.
The instructions are shown when you choose the Elementor Popup action.
When you choose Elementor Popup in Buttonizer you will get a code:
You will then go to your Elementor Popup's advanced settings -> Open By Selector and paste the code there.
And that should be it!
Let us know if this works for you!