FootballNet - Not able to add to the slider

I have attempted to add a further item to the slider, however the page seems generally unresponsive. If I click on any of the previous banner images the fields do not populate. None of the buttons can be toggled on or off. The 'upload' and 'add slide' buttons are unresponsive.
I am using 2.4.4 of the theme and realise version 2.5 is available. I cannot see an easy way to automatically update the theme. I have accessed 'Appearance > Themes' form where you can usually update themes, however there is no update button. Could someone please advise how to update automatically, and if by updating I should be able to add to the slider.

The theme worked OK when I last used it (7th September 2020). Could someone please help here. Many thanks.

Sorry, this is not resolves, I thought the solution link redirected to a possible solution. This issue is still open.