Error 126 when trying to update InDesign plus other problems

I've tried to update InDesign on my Creative Cloud app a few times now and I keep getting Error code 126 on my Macbook Pro. I found this conversation with a strategy for fixing the problem. It suggests that you sign into your Adobe account and view the Products page. It says, "In Registered products, select Download for the app you want to download." But nothing is appearing there except for my Adobe Stock subscription. I have a Creative Cloud All Apps subscription already that I've been using for years. I'm not sure how to fix this problem. InDesign will no longer open at all.