Tralfazz, help! Homebrew installation gone wrong!

[Anaxapart]

I followed the instructions of your Jan.02 2022 post. Some differences cropped up during the installation of Homebrew, but I assumed these had been due to updates and continued. Specifically, the principle changes were:
1. I was not asked if I want to install the Xcode command-line tools; it went ahead and installed them, as far as I could tell, anyway. When I (rather blindly) followed the original instructions and typed YES anyway, Terminal went nuts and started typing an endless column of ‘y’s. After a bit I turned Terminal off and repeated the procedure, without typing YES this time.
2. The process ran for a long time by itself. I did not get a chance to input “brew install wine-stable”, because at one point Terminal typed “Downloading and installing Homebrew…” and apparently proceeded to do just that. This might be were I went wrong, but I’m not clear what if anything I could have done.

At the end, I typed in “brew doctor” but the only response was:

iMac:~ jcs$ brew doctor
Please note that these warnings are just used to help the Homebrew maintainers
with debugging if you file an issue. If everything you use Homebrew for is
working fine: please don't worry or file an issue; just ignore this. Thanks!

Warning: You are using macOS 10.13.
We (and Apple) do not provide support for this old version.

You will encounter build failures with some formulae.
Please create pull requests instead of asking for help on Homebrew's GitHub, Twitter or any other official channels. You are responsible for resolvingany issues you experience while you are running this old version.

So I assumed all was OK.

I then dragged the file LotroLauncher.exe to the right side of the dock. Unfortunately, instead of launching the game, clicking on it simply produces a new version of the LotroLauncher folder in the Lord of the Rings Online folder. Weird.

I next tried to launch the game by clicking on the old lotroclient icon. This took me through all the stages of launching the game including the familiar error messages (DDLfiles are missing) and (installer error: 16389 and DLL files are missing). At the very last screen, selecting a world, once a world is selected, the message “getting in line” flashes very briefly, and then nothing more happens.

Now stuck and in need of assistance!
Many thanks in advance.

PS: I should add that this is all happening on an iMac running High Sierra 10.13.6 which cannot be upgraded further, but I remember Tralfazz assuring me that the procedure should still work!