What you are trying to translate between?

Many dual subtitle extensions operate on a freemium model. The base extension is free to download and provides standard dual captions for popular languages. However, advanced options—like machine-translation for rare languages, custom font styling, subtitle downloading, or audio speed syncing—often require a premium upgrade. The Truth About Cracked License Keys

Grant the necessary permissions for the extension to read video data on the Udemy website.

Type in the name of the trusted extension (e.g., "Udemy Dual Subtitles") and check the user reviews and developer badges to ensure authenticity.