How to Install / Update / Upgrade Official Ice Cream Sandwich (ICS) on Android 4.0.3

Android 4.0.3 was released OFFICIALLY in mid March 2012, I am installing the european version (europe) of the Official Ice Cream Sandwich ROM, Android 4.0.3 on my Samsung Galaxy S2 / SII, I am updating, upgrading from gingerbread 2.3.6 which has kept all my personalisations like contacts background/lock screen images as well as any images/documents I had on the smartphone

Link to ROM (I9100XXLPQ) Download:
http://hotfile.com/get/149514867/4f68f37e/6a07fe4/I9100XXLPQ_I9100OXALPQ_XEO.zip

Link to Odin Download:http://dl.xda-developers.com/attachdl/597bab9c4cab6e82697eab76694d2fb1/5043c5f2/5/8/1/9/1/3/Odin3-v1.85.zip