There are two versions of these saves: The MyWeddingStories vs NonMyWeddingStories with various other differences in CC, vamp locations, etc., but a pretty big difference is mentioned below. The MWS version is the only version I'll ever update and is the most recent iteration.
Aside from the CC you could download with the sims you might have taken from my Twilight Sims download page, you can use any sort of CC for your versions of these saves.
You NEED the Packs VAMPIRES, GET TOGETHER, GET TO WORK, CITY LIVING, ISLAND LIVING, COTTAGE LIVING, JUNGLE ADVENTURE for these saves to work well for you.
List of ALL the Packs Used
GTW
Seasons
C&D
CityLiv
IslLiv
CotLiv
JungAdv
Vampires
Werew
MWS
Outdoor Retreat
GetTog
GetFam
DiscoUni
SnoEsc
DreamHoDec
Worlds
Willow Creek is Forks
Oasis Springs is the South, Egypt, and Arizona (I didn't have Strangerville plus there is no North African world in the Sims 4)
San Myushno is Seattle
Selvadorada is the Amazon region/Patanals (the Amazon coven); could also be where Nauel and Pire live, I forget whether it's here or Sulani
Sulani is a Polynesian region, so Jacob's sister and her husband live there. Also where Isle Esme.
Windenburg's northwest region is where the Denali live
MWS
Tartosa is Volterra
Non-MWS
Forgotten Hollow is Volterra
Needed Mods/CC
LittleMSam: Holiday Home OR More Buyable Venues (for the lots the Volturi or the Cullens own)
Recommended Mods/CC
My Twilight Mod, but it's Retired, so...
Srslysims: World Rename Tool (to rename worlds however you wish)
Zerbu: All Worlds are Residential (esp for the Amazon Coven)
LittleMSam: Personal Objects; Unlock/Lock Doors
Lots Used & Edited/Sim-Builders to Credit (but the CC are not included in this Download):
Brookdrew9789_Swan House
puuuella_Volterra Volturi
puuuella_Volturi
CourtneyRose001_The Cullen Manor
EMLZ85_Twilight Cottage
Bexalot_Key Point or "Isle Esme"
saralemmess_The Black House
levina_leroy93__Dwyer Residence
puuuella_The Denali House
puuuella_Egyptian Coven
ResidentZ0mbie_the Barn
amitaliri_Warehouse Conversion
* and others I lost track of*