To get an unnumbered footnote in LaTeX, one has to define a new command based on the original \footnotetext{} command.
Step 1: Define the following anywhere in your code, or in your definition file if it happens that you use one.
\def\unnumfootnote{\xdef\@thefnmark{}\@footnotetext}
Step 2: You can start using \unnumfootnote{your text} instead of \footnote{your text} to generate unnumbered footnotes.

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