Make sure the mod is enabled in Skyrim's launcher or in the mod manager you're using. Make sure you have completed all Skeleton Key quests and told him that the Key has been returned to its place, leave Brynjolf's location, then return to him again and talk to him. For marriage dialogue to appear you should be wearing an Amulet of Mara, had previously discussed marriage traditions with Maramal, and not be married to anyone else.

but when i tried all i could say was "hows the guild?"

and i did the quests and had the amulet on

i tried it again it worked