https://i.ibb.co/vmQvLzk/Why.jpg
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New: Draw.io (Jun 2, 2022), Platform 22.0b1 (Jun 10, 2022)
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https://i.ibb.co/vmQvLzk/Why.jpg
[Moved to appropriate forum - mod GC]
As indicated in the image you've linked, the files are unable to be downloaded. The reason for this is listed:
Unable to download file. This could be due to a proxy or network issue or the hosting server not permitting downloads from your location.
I run into this issue occasionally when attempting to download from my corporate network. The answer for me, is to use a different location to download.
How and where are you downloading? IE, what type of network, and what country?