You need to go the master repository and check in the VSE880P1.zip package. Then go to the extensions and check in both VIRUSSCAN8800(191) and VIRUSSCANREPORTS120(136).zip. Then, make sure your McAfee Agent -> General policy for the system to upgrade has the correct branch selected for "Patches and service packs". Then, create a McAfee Agent Product Update Task (not a Product Deployment Task) and make sure "VirusScan Enterprise 8.8.0" is selected in the "Package types:" section. Finally, assign the task to the system(s) you want to update.
Also, make sure you aren't trying to deploy the full repost as an upgrade.