Hello there,

It seems that this question is more WordPress related and not our support scope. You can read some useful articles before migration here

https://codex.wordpress.org/Moving_WordPress
https://www.elegantthemes.com/blog/resources/get-your-site-moving-with-9-of-the-best-wordpress-migration-plugins
http://www.wpexplorer.com/migrating-wordpress-website/

As for our theme there is no any special instruction for transfer. Just keep all files and it will work correct.

Regards