I am trying to upgrade from 7610 to 7611 to 8004. I ran the upgrade to 7611 and it ran correctly. Now when I try to migrate from 7611 to 8004 I'm getting an error message in the command prompt box and the upgrade fails. I'm getting an "unexpected end of ZLIB input stream" error and (Unknown Source) errors as it reads through the other files. The Installation Wizard just stops and says "Error Occured...".

 

Any advice would be appreciated.