Thanks for your inquiry.
I have tested the scenario and have managed to produce the System.ArgumentException while converting Docx to Docm. For the sake of correction, I have logged this problem in our issue tracking system as WORDSNET-10637. I have linked this forum thread to the same issue and you will be notified via this forum thread once this issue is resolved.
We apologize for your inconvenience.
Thanks for your patience. Please use the latest version of Aspose.Words for .NET 14.9.0. This issue has been fixed in latest version of Aspose.Words for .NET 14.9.0.
Please feel free to ask if you have any question about Aspose.Words, we will be happy to help you.
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