Soprano Theme (Author: Puzzle themes) - bug after wp update to version 5.6

Hi, I have purchased the soprano theme 1,5 years ago and unfortunately my support has been expired. The reason why I am asking for your support: Last week I was updating WordPress to the latest version 5.6. The update was successful but the site went down: demo-show of the frontend did not work properly ((button/links, sliders , other features did not function anymore etc.) or displayed just a blank site . I had to downgrade Wordpress to the former version 5.3.2 to get my site working again. Since it cannot be a long-term solution using an older WP-version on regular base I hope for a real solution and your expertise. Many Thanks!