Currently R4J Cloud is in a beta state, so there is no publicly available link in the Atlassian marketplace for the installation. Please follow these steps:
Set up a Jira Cloud instance for your company usage.
Set up prerequisites in the instance to work efficiently with R4J Cloud.
Request the installation URL from our service desk.
Follow the installation steps provided in the R4J Cloud 0.1 release notes.
Activate the projects you want to use within R4J.