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Starting with Retrospect 9.5 for Windows, you can change the language of Retrospect from the Control Panel.

Open Control Panel.
Navigate to Control Panel > Clock, Language, and Region > Change the date, time, or number format.
Select your preferred language in Formats > Format. Retrospect for Windows supports English, German, Spanish, French, Italian, and Japanese.
Relaunch Retrospect. The app will now display in that language.
If you want to use a specific language (i.e. Retrospect in French on a system that is Dutch), you can set the language manually in the INI file, located in
Last Update: March 17, 2015