Respawn dashboard settings are unusable

I just installed the theme and Respawns’ menu settings are invisible to me.
Console states:

Uncaught TypeError: $(...).live is not a function
<anonymous> <my_url>/wp-content/themes/respawn/assets/js/admin.js?ver=1.3:62
    jQuery 4
        i
        fireWith
        ready
        J

And after a while:

Uncaught TypeError: s is undefined
    <anonymous> <my_url>/wp-includes/js/wp-auth-check.min.js?ver=5.5:2
    jQuery 7
    xhr <my_url>/wp-includes/js/heartbeat.min.js?ver=5.5:2
    jQuery 6
        i
        fireWith
        x
        c
        send
        ajax
    l <my_url>/wp-includes/js/heartbeat.min.js?ver=5.5:2
    d <my_url>/wp-includes/js/heartbeat.min.js?ver=5.5:2
    v <my_url>/wp-includes/js/heartbeat.min.js?ver=5.5:2
    heartbeat <my_url>/wp-includes/js/heartbeat.min.js?ver=5.5:2

<my_url> is my actual URL, replaced.

Please advise.