Exception when trying to access platform-explorer on cap-8.2 or cap-8.3

When trying to install on a vanilla 8.2 platform :

• ./bin/nuxeoctl mp-install platform-explorer-1.6.2
  Package platform-explorer-1.6.2 not available on platform version cap-8.2.

• After forcing installation, when trying to access http://localhost:8080/nuxeo/site/distribution got a

  Caused by: java.lang.reflect.InvocationTargetException
          at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
          at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
          at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
          at java.lang.reflect.Method.invoke(Method.java:497)
          at freemarker.ext.beans.BeansWrapper.invokeMethod(BeansWrapper.java:1458)
          at freemarker.ext.beans.BeanModel.invokeThroughDescriptor(BeanModel.java:255)
          at freemarker.ext.beans.BeanModel.get(BeanModel.java:159)
          ... 107 more
  Caused by: java.lang.NullPointerException
          at org.nuxeo.apidoc.browse.Distribution.getRuntimeDistribution(Distribution.java:215)
          ... 114 more