how to check siunitx package installed or not

[political science]

When I compile this  I get message Unfortunatley the package siunitx could
not be installed and an error File siunitx.sty' not found. \begin I am on a
Windows 10 laptop.

The code I am trying to run is an example code after reading a tutorial on
table I wrote following tex.

\documentclass{article} \usepackage{siunitx} %\sisetup{ %round-mode =
places, %round-precision = 2, %} \begin{document} \begin{table}[h!] \begin{
center} \caption{Your first label} \label{tab:table1} \begin{tabular}{l | S
| r} \textbf{Value 1} & \textbf{Value 2} & \textbf{Value 3}\\ $\alpha$ & $
\beta$ & $\gamma$ \\ \hline 1 & 1110.1 & a \\ 2 & 10.1 & b \\ 3 & 23.113231
& c \\ \end{tabular} \end{center} \end{table} \end{document}


What should I do to check the siunitx package installation is there or not?
Or if it is not there then how do I install.
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