Hello @Dzmitry Zhyvatniuk
Welcome to the Atlassian Community!
Per your description, I understand that you would like to know if you need to renew your Jira Server maintenance subscription to use Confluence Server. Is that correct?
The short answer is: No. It is not necessary to renew your Jira Server subscription to use another Atlassian product, including Confluence. To download Confluence Server and start a new free trial, you can use the link below:
Download Confluence Server
If you need more assistance about billing license questions, you can contact our customer advocates team in the link below:
https://support.atlassian.com/contact/#/
Let us know if you have any questions.
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