Today I've installed nod32 2.7 rc and even if it had 1.1857 embedded I downloaded 5400 kb: engine0, engine1, engine2, etc... and I get the 1.1859 update. Later I clicked update again to download the 1860 update. NOD32 started downloading again 5400 kb: engine0, engine1, engine2... Why? The usual update was around 130 kb. I've noticed anyway you've dropped the "1." from definition version and now the latest one is 1860 not 1.1860.