This indicates that the package is an incremental update meant to bring an existing installation of Photoshop 2020 up to the final stable build of the v21 series. System Requirements for Photoshop 2020
Here’s a useful, realistic user review for : adobe photoshop 2020 v2125 tntdmg upd
Unofficial versions may lack the necessary background processes required for Photoshop to communicate with your hardware drivers. This indicates that the package is an incremental