TightVNC 2.8.87 is the latest release (March 2026) and officially supports Windows XP and later versions.
For those with very old CPUs, UltraVNC 1.2.1.6 offers a specific "XP distribution" built with older compilers for better compatibility. vnc viewer download windows xp
Windows XP lacks modern security protocols. Because versions like TightVNC do not have built-in transport encryption, it is highly recommended to run your VNC session through an or a VPN to keep your connection secure. TightVNC 2