Exporting multiple photos/videos error --> wrong zip file

Hi,
I have a problem with downloading multiple photos or videos via AirDroid.
In case of downloading multiple photos or videos AirDroid generates one big ZIP file.
Some time age (I think that mean some versions ago) - it worked ok for me, but now I can download ZIP file, i can extract it, but all files are corrupted.

Some info:
Samsung GT-S7580 (Galaxy Trend Pro) with Android 4.2.2
All operations performed under 64 bit Debian on IceWeasel and Konqueror web browsers.

Any idea? - thanks in advance

LOL... i have solution....

The problem is in my computer software. "Ark" couldn't extract ZIP file correctly, but the same ZIP file moved under Win 7 64bit was properly extracted, and all is ok. all

...so Im sorry for wasting Your time.

I suppose - this topic can be deleted.