To patch your vanilla The Witcher 2 installation to Enhanced Edition manually, use the links below. More info on patching below the links.
PLEASE NOTE! This patch is not for Steam. If you use it to patch the Steam version of the game you will render the game incompatible with Steam. The Witcher 2 on Steam is kept up to date, and the a freshly installed game is already 3.4 (the latest version) from the very moment of installation.
Also, note that this patch is NOT FOR THE ENHANCED EDITION, as it already is on this patch’s level (3.0). This patch upgrades the 2011 release version of the game to Enhanced Edition.