As an aside, you absolutely, positively should not have to touch Windows Firewall when it comes to Windows Updates, including Feature Updates.
If your system is being cranky about doing a Feature Update, there are multiple ways around that issue. The same technique that is used to do an "install-over repair upgrade" should be used to do an actual Feature Update on a machine that gets stuck, for whatever reason. The only difference is that it's not attempting to repair the same version of Windows 10, but to upgrade it to the next version. Take your pick from the following three sets of instructions, all of which are telling you how to do exactly the same thing:
Brian - Windows 10 Home, 64-Bit, Version 1809, Build 17763
A great deal of intelligence can be invested in ignorance when the need for illusion is deep.
~ Saul Bellow, To Jerusalem and Back