...
I have a certificate file and key, how do I create a keystore?
Creating keystores is described in this sectionSee Creating a keystore.
How do I migrate SSL settings from License Statistics 5.x to 6.x?
...
In License Statistics 6.x, both of these files must be placed into a placed into a keystore. See this link for details. After generating the keystore, see this link Enabling Tomcat SSL for configuration details.