MGM App for Ultra Roku Model #4200R

gebo131

MGM+ in channel store:

https://channelstore.roku.com/details/820fda2e201c1720bbf7fb6915619725/mgm

or search for MGM on your ROKU menu under streaming store then search for MGM+

MGM+ is not free you need to either subscribe to it with a cable TV provider or sigh up directly and pay:

https://www.mgmplus.com/choose-plan

gebo131-

Where are you located?

Per the MGM+ FAQ page (as of Aug 24, 2023 -- check page for updates):
MGM+ is only available in the United States and its territories.