Welcome to Flarum!
To help us help you, please provide some extra info (please redact sensitive info)
- Are you using a VPS or Shared Hosting?
- What have you tried so far?
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As Prosperous mentions, installation is completed with composer.
Have you tried following the installation guide (which you mention seeing)?
If you had a issue, please tell us what is going wrong
Also, please keep posts about this specific issue to this thread.
Thank you!