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You are rushing things. I know you are worrying about your thesis and want things done and are in a hurry. I am here in my spare time, i have a paid job. There shouldn't be any need to install anything. Or play around with code snippets found on the internet. Do the things step by step. You now have...

It is really simple, just put a percent sign before the line loading natbib. There is even a compatibility option for biblatex, so you don't have to change anything in you document.

Just be aware that you have to call biber instead of bibTeX (should be described in the link)

Please have a look at https://en.wikibooks.org/wiki/LaTeX/Bib ... _and_biber

You have to use and, as it is just the english conjunction by chance, it is a special name separation keyword. The problem is, that you are using an english style. With the old bibtex system, changing the language ist not easy. I prefer the more modern biblatex system, which can handle utf8 and diff...

Welcome to the forum,

with the information given, nobody can answer your question.
Personally, i don't even understand the problem.

There is a table a little down the page that does not show a capital beta. And even the part you mention has the following note: Note that some uppercase Greek letters look like Latin ones, so they are not provided by LaTeX (e.g. uppercase Alpha and Beta are just "A" and "B" resp...

When notepad asks you, try latin9.

Is the simple windows notepad really giving you any options when opening a file?

I haven't been on a windows machine for years, i cannot tell.

Here is a german link that might be helpful https://texwelt.de/fragen/2656/wie-uber ... nem-editor

A minimal working example lets me reproduce your issue on my machine, and just the issue. Please have a look at https://en.wikibooks.org/wiki/LaTeX/How_to_get_help and http://minimalbeispiel.de/mini-en.html The toc file is in the same folder as your tex file is, probably you are on a windows machine...

Open the files with notepad and copy the content to your LaTeX editor. Save the content under a new name.