How can i find out if there is an upgrade for this theme for Wordpress 5.
If you go to details page you will see Software Version: WordPress 4.9.x. So your theme is not uptodate with wordpress 5. you can ask the theme Author in comments or support when the theme will be ready for wordpress 5. Thanks
Sorry new to this, how do i contact the theme Author?
ask your question at here as a comments
check this helpful article how to Contact Author. Thanks