Download the latest version from the official WinUAE website. Install it normally.
Once you have your ROM files (usually ending in .rom ), you need to tell WinUAE where to find them: Open WinUAE and go to the panel on the left. winuae roms download
Kickstart ROMs are copyrighted firmware. To stay legal, you have two primary options: Amiga Forever Download the latest version from the official WinUAE website