how is it that if you download the same patch from 2 different sites, the upgrades will be different?

Question

about a year ago i've downloaded diablo 2 v1.10.The only upgrade i've gotten was something called "SYNERGY",but when i downloaded the same version this summer, i had to fight tougher monsers and a trick called shift+click was deleted.that trick allows you to buy lots of potions even tough the merchant doesn't sell it and he only has one, namely the one you sold him

Answer 1

I would think that every time they release a patch they put more recently upgraded stuff into it :)