Adobe Photoshop does not have standalone "language pack" installers. Instead, you change the language through the Adobe Creative Cloud desktop application
C:\Program Files\Adobe\Adobe Photoshop [Version]\LocalesApplications/Adobe Photoshop [Version]/Contents/Resources/LocalesNavigate to the Photoshop installation folder (usually Locales > [Your_Language] > Support Files). Adobe Photoshop Language Pack Download
How to Download Adobe Photoshop Language Pack Adobe Photoshop does not have standalone "language pack"
If you have multiple languages installed, you can toggle between them without reinstalling: (Windows) or Preferences Presentation section, look for the UI Language Select the language you want to use. Restart Photoshop for the changes to take effect. Important Note: Adobe Photoshop Language Pack Download
Under the Presentation section, look for the UI Language dropdown. Select your newly downloaded language and click OK. Restart Photoshop for the interface changes to take effect. Common Issues and Workarounds Adobe Photoshop CS5 Language Pack en_GB | Community