First I was directed to the Microsoft Store, but no Update for MSFS showed up. Here's a hint for others who may have this issue. Go to the lower left in the Microsoft Store to Libraries and click it. Then when the window opens, click Get Updates in the upper right. The initial Update was there and very short, 531 MB or so. Then relaunch MSFS and you will be prompted to install the larger Update, which takes some time. Once the mandatory Update is installed, go to your Content Manager, all the rest of the Updates are there, about the same size as the mandatory Update, 6+ GB. Took half of my evening.
As mentioned above, there was a very small quick download patch yesterday.
Caz