VMware provides a checksum with each download. That's how you can verify the ISO images intergity.
What I assume that you did with the ISO image is that you uploaded it ato a datastore, and attached it to the vCSA's virtual CD-ROM drive.
If that's the case, and all the services that are suppored to run (i.e. the ones which show start type Automatic in the VAMI console), it may be worth a try to run software-packages unstage to cleanup the staging space.
André