Follow the below instructions to install 123 Movies Addon on Kodi 17 Krypton:
01. From the main screen of Kodi click on Addons
02. Now click on Settings Icon that you can see at the top left side of your screen
03. Select Addons option and click on Unknown Sources option to enable unknown sources on your Kodi
04. Once you will click on Unknown Sources option you will get an popup window, then press Yes
05. Now you need to return back to the main screen of Kodi by pressing the return button(Back arrow)
06. Click on Settings Icon that you can see at the top left side of your screen
07. Click on File Manager
08. Click on Add Source
09. Click on None(Text box) and Keyboard will popup on the screen
11. After that click on Text Box underneath “Enter a name for this media Source”, type muckys and click on OK
12. After that you need to return back to the main screen of Kodi by pressing the return button(Back arrow)
13. Click on Addons
14. Now click on Addon Browser Icon that you can see on the top left corner of your screen
15. Click on Install From Zip File
16. Click on muckys
17. Click on repository.mdrepo.xx.x.zip and wait for Addon Enabled notification
18. Now click on Install from repository
19. Click on Mucky Ducks Repo
20. Click on Video Addons
21. Click on 123 Movies
22. Click on Install and then wait for Addon Enabled notification
123 Movies Addon is now installed. The Addon can be accessed by going back to the main screen of Kodi >Add-ons and there you will find 123 Movies Addon