You can download the SP2 ISO image (32-bit) or the x64 version , but these are cumulative updates, not standalone operating systems.
To burn your ISO to a physical disc, locate the file, right-click it, and select "Burn disc image" using the Windows Disc Image Burner. Microsoft Learn Virtual Environments: windows server 2003 iso download
Operating systems of this era lack the security protocols necessary to withstand modern ransomware and DDoS attacks. You can download the SP2 ISO image (32-bit)