In addition to the controller's upgrade, it's recommended to update the application signature package. This is an application database that the APs use to recognize applications used by the users of the wireless network, Its main purpose is for security configuration and statistics.
How to upgrade the sigpack?
Manually upgrade the signature package by navigating to Firewall > Application Control > Signature Package. (more details can be found in Administrator Guide, in the section Working with Application Signature Package)
Refer to the below links to download the 18.104.22.168.1563 software. Bear in mind the vSZ may require some adjustments in RAM memory and disk space. I am also sharing a link to verify that based on the number of APs in your controller.