Good afternoon.
I solved my problem as follows:
The files that come with the premium theme are:
1. .Jar
2. A pasta resources com o CSS, Images, Fonts e JS.
To perform integration via Maven you need to:
Download Maven manually and configure it on the machine.
Via cmd I navigated to the folder that was saved the theme, ie .jar
Once you have installed and configured maven I ran the following command via cmd:
mvn install:install-file -Dfile=spark-theme-1.0.jar -DgroupId=org.primefaces.themes -DartifactId=spark -Dversion=1.0 -Dpackaging=jar
And then I ran this dependency on pom.xml
<dependency>
<groupId>org.primefaces.themes</groupId>
<artifactId>spark</artifactId>
<version>1.0</version>
</dependency>
It worked out just a beauty! I hope to help other people.