123 Movies is a popular Kodi add-on that as the name suggest plays movies.
The layout is simple but nice with Most favorite, Most Ratings, Most viewed, Genre, and more selection options.
It is located in Mucky ducks repository so if you have Muckys installed simply skip to the parts needed below. Below is the step-by-step installation of Mucky Ducks Repo and than 123Movies with pictures.
Repo Location
Name: Mucky Ducks Repo
URL: http://muckys.mediaportal4kodi.ml/
How To Install 123Movies Into Kodi
1… System–>File Manager
2… Add Source
3… Click were it says NONE
4… Enter the URL: http://muckys.mediaportal4kodi.ml/
5… Name it Mucky Duck and click OK.
6… From the main menu go-to System–>Settings
7… Add-ons
8… Install from zip file
9… A box will slide open select Mucky Duck
10… Click repository.mdrepo-1.0.1.zip (If there is a newer version install it)
11… Install from repository
12… Mucky Ducks Repo
13… Video add-ons
14… Click 123Movies and Install