Elementor Pro 3.21.0

* Tweak: Added CSS classes control to Popup
* Tweak: Added responsive image size to Testimonial Carousel widget
* Fix: PHP warning when Toolset Date dynamic is empty
* Fix: Support of exclude-ids in WC Products widget
* Fix: Popup close button not clickable
* Fix: Alignment justify issue of Add to Cart widget
* Fix: Bad anchors breaks the page JS
* Fix: Popup overlay shown when turned off

New: Introducing Popup Builder
New: Added Popup Dynamic Tag
New: Added Popup forms action after submit
New: Added User Info dynamic tag
Tweak: Added dynamic capabilities for "Nothing Found" message
Tweak: Added elementor_pro/theme_builder/archive/escape_nothing_found_message Filter to avoid HTML escaping in "Nothing Found" message
Tweak: Added add_doc_to_location method to Allow insertion of a document to a location
Fix: z-index issue with CTA widget
Fix: Hide the Post Content widget and show it only in a Single document
Fix: selector replacement in Custom CSS
Fix: Apply the_content on the real content only
Fix: CSS for WC products selector
Fix: Odnoklassniki share URL
Fix: Custom link new tab in Post Info widget
Fix: nofollow link in Flip Box & CTA widgets
Fix: Post Terms in Post Info widget
Fix: Added screen reader to some icons & buttons for better accessibility
Fix: Accessibility labels in Reviews widget
Fix: Link to cart page not working when WooCommerce Subscriptions is active
Fix: MailChimp Selected list not showing on reloading in Form widget
Fix: Sub-menu arrow position in Nav Menu widget
Fix: Conflict with WP Security Audit Log plugin

Update: Elementor free plugin to v2.4.1
Be carefully,may not be compatible with elementor pro 2.3.1