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thanks for your help

I want to write an article which use amcs class (download link on bottom of page). But I don't know how to install the class file (*.cls). The document must start with \documentclass{amcs}. But I get an error message. Any help is appreciated.

Thank you very much

I want to write aligned some equations in table cells. But I cannot use {align}, {split} etc. How can I use these blocks or alternative one.

Example:
\begin{tabular}{|c|c|}
\hline
%%%%%%%1. cell
\begin{align}
x&=a+b\\
y&=c+d
\end{align} &
%%%%%%%2. cell
\begin{align}
x&=a+b\\
y&=c+d
\end{align ...