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Questions about GroupDocs.Viewer for Java

Few questions may need your help.

  1. Please advise if we could purchase GroupDocs.Viewer for Java V20.7 and lower the Version to V19.8.1?
    (Use the new version key to register old version)
  2. When we use V19.8.1, the explorer cannot shows the correct page of the PPT.
    Here us the PPT.
    如何寫出有效率的 (1.5 MB)

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