I'm testing the StageNow (PC 22.214.171.1243, Android 126.96.36.1992) functions with a KK TC55 and can successfully configure a WiFi profile and connect to a WiFi network.
However, when I try the 'Manage Applications' functions, I only got the "Staging Failed" message.
Firstly, I copied the APK to /sdcard/Download and use the 'Upgrade' action. Secondly, I tried the 'Download the file to my device' but input to the 'Source File URL' field is not accepted.
Before scanning the 'Manage Applications' bar code, the TC55 was connected a the same WiFi network with the StageNow PC.
I attached xml file of the profile and screen capture for the 'Source File URL' for reference.