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Alignment stops when merging documents

I'm trying to align two large documents, and the alignment tool stops immediately when it starts to merge them. I have tried opening them in Word under 'Open and repair', but the same problem persists. I cannot download the OpenExchange app because there does not appear to be a version compatible with Studio 2017.

The document to translate is virtually the same as others that were previously translated elsewhere, and it would really be helpful to align them.

Any help?