Hi,
Yes, it is possible to downgrade a Microsoft Server Standard 2025 license CSP LTSC to 2019. However, this is subject to certain conditions and requirements. You will need to have a valid license for Microsoft Server Standard 2019, and you will need to follow the downgrade rights outlined in the licensing terms and conditions. It is recommended that you consult with a Microsoft licensing specialist or your Microsoft reseller for more information on the downgrade process and requirements.