Because this file is old, its security signature may have expired. macOS will flag it as "damaged" or from an unidentified developer.
Open Photoshop from the Launchpad. You will be prompted to sign in with an Adobe ID. If you own a perpetual license, enter the serial key. If you are using a trial version, you have 7 days. AdobePhotoshop19-macos.dmg
If you have a legitimate DMG and it won't install, here are the fixes. Because this file is old, its security signature
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