problem uploading plug-in optincrusher3

I am triing to upload a plug-in and it’s not working. The instructions from the site say to upload the zip file from the plug-in pannel on WP.Below is what it sais on my screen when triing to do so

Installing Plugin from uploaded file: optincrusher3.zip
Unpacking the package…

It doesn’t go pass the unpacking stage.Anyone know?

plus I have tried installing it through filezilla (unzipped though)and nothing shows up in wp administration panel, plug-ins, widgets etc…