Try to re-download the installer. It occur when there's something wrong with your installer :)
Before downloading, firs <a href="#num7460">View</a>" target="_blank">community.jcow.net/forums/viewthread/1909#num7460">View</a> | <a href="community.jcow.net/forums/newreply/7499" >Reply</a>
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i recieved this error when i was trying to install the Jcow:
