This app is only available for Atlassian Jira Cloud. Currently we currently do not plan to release a version for Server or Data Center.
If you want to install our app, read the Install Cloud Workflows guide
If you want to integrate conditions, validators or post functions, read the Workflow Extensions guides.
If you want to build custom expressions, check out this guide Using conditional execution
Cloud Workflows on the Atlassian Marketplace
Cloud Workflows Support & Help Center
Jira Cloud Documentation