I saw this post a couple of days back that might be able to help you. [URL] 
When I try to import the ISM-Dell-Web-2.3.0-223.VIB-ESX60i_A00.zip package to our vmware update manager I get the following error. Any hints ? The md5 checksum value is correct. (and I can unpack the zipfile without problems on my pc) [IMAGE]
ISM-Dell-Web-2.3.0-223.VIB-ESX60i_A00.zip 'invalid package'