my book says download jquery 1.6.2 zip file , where can be found?

my book says download jquery 1.6.2 zip file , where can be found?

zip contents:

jqueryui

-jqueryui1.6rc2

--_MACOSX

--demos

--tests

--themes

--ui

-img

-styles

my book says download jquery 1.6.2 zip file , where can be found EXACTLY?