KB949104 "There is no standalone installer of the windows update agent (v7.6.7600.256 XP and 7.6.7600.320 Win7) available at this time" but I was able to create one using updated files from KB2938066 with the previous version 7.6.7600.243 standalone installer as base (thanks to submix8c)
x64: http://adf.ly/1713566/wuax64
MD5: 93bcbb12d6d53d40a14f2c2899172ee6
Size: 10.7 MB
x86: http://adf.ly/1713566/wuax86
MD5: 8c8c7afec7c17837bee660dcbd035bd0
Size: 9.27 MB