We have Jira Core, Jira HelpDesk, Jira Software, Jira Confluence. All server versions. I have installed CORE and it works, i can access it. Now i want to install HelpDesk and other aplications from Jira. How? I want to all Jira applications interact with each other.
welcome to Atlassian Community!
From an already installed Jira Core it is very easy to install Jira Software or Jira Service Desk.
Please have a look at the following guide: https://confluence.atlassian.com/adminjiraserver/licensing-your-jira-applications-938847718.html
Confluence needs a separate installation but it integrates nicely with Jira later on - after separate installation.
In case of further questions Community is here for help.
Replying to my self:
If you want to have Jira Software or/and Jira HelpDesk in an server CORE installation, you need to finf HelpDesk and Software applications in marketplace, and upload it. Then you can add licenses.
So all installations for self-hosting applications, are for first time install. Sfter that, you have to add apps inside CORE installation.