Is there no way to install phpseclib 2.0 or 3.0 without composer? [duplicate]

My php application has used phpseclib 1.0 for years with php 7.x.
The server was just upgraded to php 8.2 and phpseclib 1.0 no longer works.
The server runs Oracle Linux 8 and does not have internet access so composer is out of the question.

Why can’t I just unzip the code I downloaded from github?