Here is where the warning klaxons go off. Adobe does not host public archives of old Creative Cloud versions.
Perhaps the most marketed feature of V21 was the Object Selection Tool. Before this, isolating a subject from a background involved tedious lassoing or channel masking. V21 introduced a tool where you simply draw a loose rectangle or lasso around an object, and Adobe’s Sensei AI engine automatically snaps the selection to the object's edges. This feature alone cut down editing time for many photographers by 50% or more. Adobe Photoshop CC 2020 V21 Download For Mac
: This version introduced the ability to save work as cloud PSDs, facilitating seamless transitions between desktop and the then-new iPad version of Photoshop. Here is where the warning klaxons go off
If the version is not listed in your Creative Cloud app, users have successfully received direct download links for v21 by contacting Adobe Customer Care via live chat and requesting the specific legacy installer. Before this, isolating a subject from a background