kguske writes:  

Changes in the latest patched 3.1 download force changes in the installation instructions included in the Edits for Core Files of NukeSentinel, NSN Groups, and the installation instructions for CNB Your_Account, and possibly others.Though the new code is more efficient, even elegant, the old code wasn't broken or insecure. It ultimately simplifies the installation of addons like NukeSentinel and NSN Groups, but several downloaders were confused because the installation instructions for NukeSentinel were no longer valid.

Partially updated instructions for NukeSentinel can be found here.

The changes aren't required for other modules like CNB Your Account and NSN Groups, but you might wish to change the installation for these addons to take advantage of the more elegant approach. Assuming you have both CNB Your Account and NSN Groups, before the closing ?> in mainfile.php, you would add:

include_once(INCLUDE_PATH."modules/Your_Account/includes/mainfileend.php"); include_once(INCLUDE_PATH."includes/nsngr_func.php");