nexus pentaho unavailable?

Question

In my pom I have this dependency

<dependency>
    <groupId>org.pentaho.reporting.engine</groupId>
    <artifactId>classic-core</artifactId>
    <version>9.2.0.0-290</version>
</dependency>

available at https://mvnrepository.com/artifact/org.pentaho.reporting.engine/classic-core/9.2.0.0-290

But https://nexus.pentaho.org/content/groups/omni/ is unaivailable

How should I do to install?