Update Thème Realhome Estate Sale

Hello , My english is not very good excuse me !
Here, following the update of word press, my site to be bugged.
Obviously, Jquery does not support the new version.
After a lot of manipulation, I managed to put in place a backup of my site.
But by installing an old version JQUERY plugin.
As reported, sliderrevolution and realhome 3.6 theme does not support new word press.
I want to update the RealHome theme to its latest version but I don’t have an “UPDATE” link in the downloaded “envato market” plugin.
How to do??