Different versions in jQuery

I am enrolled in a computer programming course on https://www.udemy.com and the instructor downloaded the uncompressed development jQuery version 1.11.0 but this particular version seems outdated, and I cannot find anywhere to download this version. Is there really a difference between, these versions?
If yes, then please could someone provide a link to a website where I can download the uncompressed development jQuery version 1.11.0 ?