Before downloading the 4.3 O.S for the 8100 please read all the prior posts so that you fully understand what you may experience after the install is complete. It appears there will be some camera issues.
For now here is the download link.
http://www.mobile41.com/theme_tools.htm (8100 O.S 22.214.171.124)
ps. Thanks Alwaysbelieve1 and LaTuFu and teamjordan23