Yep, I had this attempt to happen on my computer last week. I do my updates manually and several weeks after seeing the Windows 10 “suggestion” I had the needed upgrades checked but I could not find the Optional one very easily. I installed the needed upgrades and came back to my computer and it said, “Click OK to continue with the Windows 10 installation.” I clicked Cancel. Later, I found the Win10 checkbox and asked that it Hide that upgrade. What a bunch of jerks.
Hiding the item gets overridden. Mine kept coming back.