Some older or specific versions of ACDSee allow a language change via the Windows Registry, though this is not officially recommended for beginners. Close ACDSee entirely.
Look for the specific download link for your language (e.g., German, French, or English). acdsee language change
Add a Language tab under Tools > Options > General that displays a dropdown list of all supported languages (e.g., English, German, French, Spanish, Chinese, Japanese, etc.). When a user selects a new language: Some older or specific versions of ACDSee allow
How to change the language in ACDSee (Full Guide) Add a Language tab under Tools > Options
ACDSee installers are typically language-specific. To switch languages properly: your current version via the Windows Control Panel ACDSee Downloads page ACDSee Account
Background details
For many standard editions of ACDSee, the language is tied to the specific installer file (e.g., an "English" installer vs. a "German" installer) .