Wait for hotfix at least and there currently an issue with fab plugin which can go missing for 5.5 similar to this post: Issue Installing Plugin for UE5.5 via Epic Games Launcher (Versioning Issue)
Wait for hotfix at least and there currently an issue with fab plugin which can go missing for 5.5 similar to this post: Issue Installing Plugin for UE5.5 via Epic Games Launcher (Versioning Issue)