WS-C3750-48P

Hi Heres the link for it , its available from what i can see , the switch is eol of July 2015 last year so thats the last release you will get

https://software.cisco.com/download/release.html?mdfid=278732271&flowid=2514&softwareid=280805680&release=12.2.55-SE10&relind=AVAILABLE&rellifecycle=ED&reltype=latest

I just re-read that :) thought you were looking for se10 sorry there definitely is no 11 your EOL on that switch no more releases you need to upgrade hardware to get new software releases 

http://www.cisco.com/c/en/us/products/collateral/switches/catalyst-3750-series-switches/end_of_life_notice_c51-574778.html

SE11 was posted this morning for 3750 and 3560 products.

Are there any release notes to what is the difference between SE10 & SE11?

Cant find anything at the usual location, the button at the download location leads to a list of release notes but there nothing about the SE11.