Hi,
if you are getting any error please post it. Or you can trace what is problem that you are getting by following steps.
1.Before run the robot take a backup of zip files directory.
2.Log the Zip file name and extract path inside the for each loop . So it will store the each zip process.
3.Finally analyze the log. you can get an idea.
To do the log in local system. you can use this activity.
Regards
Balamurugan.S