Help on Updating from X theme 4.6.4 to latest version

Hello there.
I got a problem. I lost my site on my server and all my backups at home. Yes, talk about luck! But I found my first backup on a forgotten pendrive. But although completely functioning site, it is on version 4.6.4.
I could update wordpress to 6.1.3. Now I would like to update my X Theme, but when I click check update it gives me " unable to check for update" and I am afraid to do something wrong with the process.
Would some good soul give me any advice as how should I proceed?

Thanks a lot. And by the way, noobie here.

Hi @alcaloide,

You can use Envato Market WordPress Plugin to get auto update features. This plugin helps customers receive updates to their premium wordpress Themes & Plugins purchased through Envato Market (ThemeForest & CodeCanyon).
you can download the plugin from here:

Otherwise you can download the update version from Envato Market Downloads page and update manually using ftp.

Note: Better to keep a full backup before doing the update.

Also better to contact theme author is there any compatibility issue or will you face any issue after the update because you are using very old version. Latest Version: 10.2.6.