Oracle Application Express 4.1.1 is now released and available for download. If you wish to download the full release of Application Express 4.1.1, you can get it from the Downloads page on OTN. If you have Application Express 4.1 already installed, then you need to download the APEX 4.1.1 patch set from My Oracle Support. Look up patch number 13331096.
As is stated in the patch set note that accompanies the Oracle Application Express 4.1.1 patch set: