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Click on the "Getting Started" entry in the start menu. This will open the welcome screen. Now click on Setup Adobe Photoshop, this will start the 1-click install process to install Adobe Photoshop CC 19 on your PC
Wait for everything to load and click on "OK"
Click on next and photoshop will start installing
Wait for the installation to finish
Now you can search for photoshop from the start menu and launch it
If you see the splash screen that mean you have successfully installed Adobe Photoshop
Enjoy!