One object, 2 different computer, what can be the problem?

There is a webpage, and one button on it. Before I want to click this button, I download a PDF, and after I download, I want to click that button. On one computer, I can click, on the other computer, Katalon can’t find the object, just with Delay. What can be the problem? Just the speed of the 2 computers? Is there any other idea instead of Delay?

yes, speed is issue.
use waitForElementClickable() function to wait for element be prepared correctly

It was better, thank you!