Dictionaries download but do not unzip

[GoogleCodeExporter]

IMPORTANT:  If you see ANY advertising at all, you're not using the real
QuickDic, you're using a rip-off of the open-source version.  The real
QuickDic is here:

https://play.google.com/store/apps/details?id=com.hughes.android.dictionary

Is the issue specific to a particular dictionary?  If so, which one? (For
example: DE-EN or German-English).
All it seems.

What steps will reproduce the problem?
1. Go to dictionary management screen.
2. Choose a dictionary you do not already have. I tried English, Eng-Greek, 
Eng-Catalan. Same result for all.
3. Click download. 
4. Zip file downloads. See a message saying it is unzipping, then one saying 
the unzip failed with no other info about why.

What is the expected output?
Dictionary installed. This worked for me in the past but not now.

What do you see instead?
Error message saying unzip failed.

What version of the product are you using? On what operating system?
QuickDic 5.0.1 on android 4.4.2

Please provide any additional information below.  Screenshots can be very
helpful.
I have my dictionaries on sd card. The ones installed earlier are working fine. 
I have several GB of free space on SD and 1.7GB free in regular storage so I do 
not think it is a space issue. 

Original issue reported on code.google.com by yah...@poplarware.com on 26 May 2015 at 4:16

[GoogleCodeExporter]

So I went into the generic file manager app that came with my phone. I found 
the zip files at the top level on the non SD storage and unzipped them, which 
resulted in folders containing  .quickdic files. Moved those to my quickdic 
folder on SD. They work fine.

Apparently QuickDic itself just cannot unzip them.

Original comment by yah...@poplarware.com on 26 May 2015 at 4:21

[GoogleCodeExporter]

Well I only found some of the files... anyway I see the work-around on other 
issues of downloading on a PC.

Original comment by yah...@poplarware.com on 26 May 2015 at 4:28