Hi!
It’s not possible to tell if the files in the screenshot are the correct ones, both original and custom hstshijack caplet files have the exact same name, there’s no way for me to tell if they are correct. As mentioned you need to replace the whole directory, if you have done so then yes, the files are correct.
Bettercap is the latest public tool to run mitm attacks that works well, I tested it and is still working fine.
Yes, you can skip this section by now and maybe come back to it later.

Greetings!
Diego