We would like to upgrade our flex to the latest version but we could not find any related documents on the flex github repo. Will reinstalling following the guide in https://github.com/GluuFederation/flex/blob/main/docs/install/vm-install/ubuntu.md work? Also, when we access the admin UI from the browser, the activation page is shown. We tried to follow the SSA.md to obtain a trial license but we could not figure out how to fit the JWT to our version. Please kindly advice.