packr repo seems not to work

[upost]

Adding packr to my build.gradle does not work:

repositories {
        ...
        maven {
            url "https://artifactory.nimblygames.com/artifactory/ng-public"
            name 'Nimblygames'
        }
    }
...
dependencies {
        classpath 'com.badlogicgames.packr:packr:4.4.0'
}

The required URL https://artifactory.nimblygames.com/artifactory/ng-public/com/badlogicgames/packr/packr/4.4.0/packr-4.4.0.pom returns a 404.

https://central.sonatype.com/ only has outdated version.

Something wrong or is it just me? Or is packr deprecated? In this case, maybe update the docs (and please add working sample for using jpackage, as I couldn't get that to work either)