Hmm, interesting. May be setup file was replaced?
My file (I've made the picture with it and posted earlier) is:
File: FreeFileSync_5.11_setup.exe
Size: 6281120 bytes
File Version: 5.11
Modified: Sunday, January 06, 2013, 14:03:49
MD5: FFE4DF63B5EBC624E18B91D13CF12C21
SHA1: F9DA58E7940D1A7FA8583D165D6505B2C721B517
CRC32: 61D549B0
I did not see any such offers, when I run it. My guess is, again, may be it's because I install it as "Portable"?