I don’t suggest going back to the older version of WordPress. This is because when WordPress updates to a major version (i.e. from 4.4 to 4.5) it makes changes to your database. Reverting to 4.4’s WordPress files doesn’t automatically bring your database (now updated to work with WP 4.5) back to be compatible with WP 4.4. The way forward is fix the scripts so they are compatible with WordPress 4.5’s libraries. Usually it’s a one or two line fix in a theme file.
If you have edited the theme files directly then yes you will lose those customizations when you update the theme.
The correct way to edit a theme is to create a child theme which allows you to create copies of the theme files that will be used in place of the originals. You can then update the ‘parent’ theme and the child theme keeps all of your customisations safe.
We can’t direct you as each theme is different and we can only provide support for Event Espresso. You would be much better creating a child theme and placing all of your customizations within that then updating the parent theme.
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