If you need the classic version of Microsoft Teams (Teams Classic) instead of the new "Teams 2.0" or the "New Teams" toggle, you have a few options. Microsoft is actively phasing out the old client, so downloading it directly is getting harder.
How to download and install OLD Microsoft Teams (Classic) download old microsoft teams
Microsoft plans to fully replace classic Teams between July 2024 and June 2025 . The old version will eventually stop working and will auto-update. If you need the classic version of Microsoft