It is a very common mix-up, but . The Blender Institute skipped from version 2.83 (LTS) directly to Blender 2.90 .
If you are looking for the features that would have been in a "2.89" version, they are found in the 2.9x releases: 2.80 — Blender blender 2.89
If you tell me the exact goal, I’ll provide the ready-to-use content (outline, text, or Blender setup instructions). It is a very common mix-up, but