Got Dwains Theme already installed?
Copy the content of the this release over your existing files and overwrite all existing files! Note: The way resources are loaded has been changed from version 1.2.* on. If you are updating from a version older then 1.2.* overwrite your ui-lovelace.yaml file with the one in this version! Do you have any custom resources? Go to the folder dwains-theme/resources/ rename the file custom_resources-sample.yaml to custom_resources.yaml and place your resources in that file! This file will never be overwritten with updates instead of the old way, so you can keep your own additional resources safe.
The way more_entities inside persons.yaml and rooms.yaml has been changed, please read the changelog.