Depending on your installation, there are four files available:
BaldursGateII-ShadowsofAmnPatchENGLISH.exe - For English players without the Throne of Bhaal expansion
BaldursGateII-ShadowsofAmnPatchEUROPE.exe - For non-English players without the Throne of Bhaal expansion
BGII-ThroneofBhaal_Patch_26498_ENGLISH.exe - For English players with the Throne of Bhaal expansion
BGII-ThroneofBhaal_Patch_26498_EUROPEAN.exe - For non-English players with the Throne of Bhaal expansion
Patches for the Enhanced Editions will be available through the service where you bought it (Beamdog, Steam, GOG).