Problem downloading files from personal messages PM Viewer

[vask0]

Hello, I installed the following application  (DP45) PM Viewer 4.0.7  but when I view users' private messages, I can't download the files they've exchanged

img1

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img2

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img3

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img4

When I try to download a file from img3  displays the following error

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[qwert]

I close the topic.  since you did not purchase this file.