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Versions 19 and 20 are separate installs completely independent of each other, so updating one won't update the other.
If you're using version 20, and are happy with it, you can ignore the 19.1.7 update, or even uninstall version 19. Version 20 will not be affected.
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Frame Tool for easy masking
Easily mask images by placing them into frames. Use the Frame Tool (K) to quickly create rectangular or elliptical placeholder frames. You can also convert any shape or text into frames and fill it with images.
To place an image into a frame, simply drag an Adobe Stock asset or a libraries asset from the Libraries panel or from your local disk — the image automatically scales to fit the frame. Content placed in frames is always placed as Smart Objects so that it can be scaled non-destructively.
For detailed information, see Place images into frames.
Content-Aware Fill reimagined
Powered by Adobe Sensei
A new, dedicated Content-Aware Fill workspace provides you an interactive editing experience to achieve seamless fill results. You can now choose which source pixels to use and rotate, scale, and mirror the source pixels thanks to Adobe Sensei technology. You also get a live full-resolution preview of the changes and an option to save the result to a new layer.
To launch the Content-Aware Fill workspace:
- Open an image in Photoshop. Using any selection tool, create an initial selection of the area you want to fill.
- From the menu bar, choose Edit > Content-Aware Fill.
In the Content-Aware Fill workspace, the document window displays the default sampling area as an overlay mask on the image. You can use the tools provided in the Tools panel (at the left of the screen) to modify the sampling area and your initial selection of the fill area. In the Content-Aware Fill panel (at the right of the screen), you can specify sampling options, fill settings, and output settings to get the desired fill result in the image. As you make changes, the Preview panel displays a live full-resolution preview of the output.
New multiple undo mode
With the new multiple undo mode, the Edit menu displays the following commands:
- Undo: Moves one step back in the undo chain. Use the shortcut keys: Control + Z (Win) / Command + Z (Mac).
- Redo: Moves one step forward. Use the shortcut keys: Shift + Control + Z (Win) / Shift + Command + Z (Mac).
- Toggle Last State works the same as in the legacy undo mode. Use the shortcut keys: Control + Alt + Z (Win) / Command + Option + Z (Mac).
For example, Edit > Undo Edit Type.
The commands Step Forward and Step Backward have been removed from the Edit menu. These commands are still available from the fly-out menu
in the History panel. Additionally, the layer visibility changes are now undoable by default. When you click a visibility icon 
in the Layers panel, a history state is created. You can control this behavior using the Make Layer Visibility Changes Undoable option from the History Options dialog, accessible from the fly-out menu in the History panel.Usability improvements
Reference Point hidden by default
Double-click to edit text
Auto-commit
Efficiently crop, transform, and place or enter text with auto-commit. You no longer need to press Enter (Win) / Return (macOS) or click the Commit 
button in the Options bar to commit your changes.When applying crop or transforming, perform any of the following actions to auto-commit your changes:
- Select a new tool.
- Click a layer in the Layers panel. (This action auto-commits changes and also selects the layer.)
- Click outside the canvas area in the document window.
- Click outside the bounding box in the canvas area.
When entering text in a Type layer, perform any of the following actions to auto-commit your changes:
- Select a new tool.
- Click a layer in the Layers panel. (This action auto-commits changes and also selects the layer.)
For related helpful information, see the following links:
Transform proportionally by default
To resize a layer proportionally during transform, do the following:
- Select the layer(s) you want to resize in the Layers panel.
- Press Command + T (Mac) / Control + T (Win). Alternatively, choose Edit > Free Transform.
- Drag a corner handle on the bounding box to resize the layer.
- Commit the changes.
For related helpful information, see the following links:
Prevent accidental panel moves with Lock Workspace
Live blend mode preview
For related helpful information, see the following links:
Symmetry mode
Color Wheel to choose colors
Home screen
Improved in-app learning
Top customer-requested features
Preference to increase UI size
does the latest version include all of the previous version..?
By @TangCanada
You didn't say which version was your previous version but 3-D was removed several years ago because it's not compatible with newer operating systems. The Photoshop team has left 22.2 available for download temporarily, which is the last version that has a working version of 3-D.
Jane
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