if the property the LLC owns is rental property or it's engaged in a business you need Turbotax Business to prepare a partnership return. then each of you will use their K-1 in preparation of their personal returns.
this software only runs on a full Windows PC - no online or MAC version is available
also, since you need to prepare separate personal returns you will need two online a/c's. if you use the same a/c to prepare both, the second one that is prepared will eliminate the first completely.