Updating the theme, editor not visible

I am coming back to my website after months for adding more content. I see the visual builder has stopped working. I updated my wordpress to the latest version. Now I saw many forums and figured out that I have to update my theme. You have showed 2 ways. 1 is manual and the 2nd is automatic. The automatic Envato Toolkit is so complex and no full of breakdowns. In the manual way to update my theme, you guys have nicely written Version history, but where the heck do I download the latest version from? There is no way to update the theme from wordpress admin internally. Please email me asap or reply here, my client is on my head.