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Error when converting PPT to PPTX

When converting two different PPTs to PPTXs I get this error:

image.png (52.3 KB)

Using: aspose-slides-19.10-jdk16.jar

Using the following code:
com.aspose.slides.Presentation presentation=new com.aspose.slides.Presentation(inputPath);
presentation.save(outputPath, com.aspose.slides.SaveFormat.Pptx);

PPTTOPPTXError.zip (2.0 MB)

@simon.wiseman,

Thanks for contacting us. I regret to inform that we do not support these formats. Can you please re-save this presentation to newest format.