Release Automation 6.2 installation can be finished, but there are not action packs.
This problem was reported on RA 188.8.131.5210. This build was released on July/2016.
If you use the build image, you may face this problem.
RA 6.2 upgraded Tomcat version from 7 to 8. This Tomcat version changed the specification of jar loading order. So, RA 184.108.40.20610 cannot load jar files of action packs with dependencies.
Installation media was updated on August/2016 on Support Online - Download Center. The build number is 220.127.116.1117. Title of the build has "Updated Installer File".
If you already downloaded old image, please download new image from Support Online and install it again.
If you don't any problem regarding action packs with RA 18.104.22.16810, you don't need to reinstall.