Updating Travel Wp Theme

Hello, first of all I wanted to thank you for all of your help and support so far since we purchased your theme, we love the theme and we are very impressed by the support and speedy assistance that you have provided, so thank you.

I see there have been 2 recent updates to the Travel Wp theme, I did not update the last one because I was waiting for the update for Wpress 5 to come out. I see you have now published another update today. Please tell me how to update the theme with out losing any of the current customisation that we have done? Do I just download the Zip file and use the Easy Theme upgrades plugin?