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How to fix «Failed to open return package» error in Trados Studio

10 June 2026
About another issue in Trados Studio
When importing a package, Trados Studio might say that it
Failed to open return package, because it contains a project that does not exist in your setup.

That it’s not a Trados Studio issue, but yours: you tried to import a return package for a project Trados Studio doesn’t know anything about.
Please check: either you forgot to import the source package first, or you’re importing a third-party package.