From the front page of the PDF:
Three years ago, Zelgar Lightborn’s brother left the town of Silvergrail on a grand adventure and was cursed with lycanthropy. Now he’s returned, along with the rest of his pack. A Living Forgotten Realms adapted adventure set in the Moonshae Isles for Adventure Level 6 (character levels 3-9). At least one person at the table (either a player or the DM) must have an active subscription to D&D Insider. We recommend that you allow at least six hours of playing time to complete this adventure.
You must have a legal copy of the published adventure to use this document. “Leader of the Pack” is found in Issue 194 of Dungeon online, part of D&D Insider. Dungeon issues may be found on the Wizards of the Coast website (http://wizards.com/dnd). This adaptation document does not present adjusted stat blocks for low/high tier; the DM is expected to use the stat blocks from the published adventure and adjust as needed. Any LFR-legal AL 6 table may play this adventure, but bear in mind that the stat blocks in the adventure were written for a party of level 4-6 characters. Tables at the low end of the level band might find this adventure very difficult.