How to Capture OTA Update for Lenovo Yoga Tablet 3 YT30850L

[AC Question]

I've tried the "adb logcat" approach to getting the URL for my OTA update. I've NOT downloaded it yet, and my device is NOT rooted. Once I start "adb logcat" I initiate the OTA download on my tablet. Once some progress is evident on the download, I CANCEL the download, stop "adb logcat" and then copy/paste/search the output. I find some vague references to OTA, but nothing gives me a clue as to the actual download URL. Has ANYONE found it? Or can anyone suggest how I might do so myself using "adb logcat" or some other method for a not rooted tablet? Thanks.