Thanks.
I was able ti fix/improve multiple things.
The issue was caused by this:

If you find any way to permanently disable this box in your chomikuj.pl account settings on their website, such downloads may work fine in JD even without requiring a plugin update.
I've also fixed bad/missing folder-crawler filenames.
You can now change the password of your account!
Wartest du auf einen angekündigten Bugfix oder ein neues Feature?
Updates werden nicht immer sofort bereitgestellt!
Bitte lies unser Update FAQ! | Please read our Update FAQ!
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Are you waiting for recently announced changes to get released?
Updates to not necessarily get released immediately!
Bitte lies unser Update FAQ! | Please read our Update FAQ!
-psp-