Hi Martin, for now its best to clone and build designer yourself from its github repo: https://github.com/droolsjbpm/jbpm-designer
1) git clone https://github.com/droolsjbpm/jbpm-designer.git
2) cd jbpm-designer
3) mvn clean install
because we are going to release 2.3 in the next few weeks
Don't forget to clear your browser cache before using a new version :)