Upgrade button is not displayed
Symptom
NAC 6.0 provides an upgrade button in the web console. (System > Genian Software) but the upgrade button may not be displayed for several reasons.
Cause
Your Server is already running the latest released version.
Your current software version is Beta (5.0.XX-B)
Resolution
You can download the software when the next version is released
You have to manually upload Release (5.0.XX-R) image once and click the manual upgrade button. (System > Tasks > Update Specific System Image)