This is what it looks like on iOS:
- Click on the "menu" button on the bottom left (square with three dashes). A menu slides in from the left. There I have several options.
Under the "gear" menu I have settings, with only trhee options, none of which helped me.
There is however in this menu a "maps and resources" option that I can select and from there I get to a screen with three tabs at the bottom: maps, plugins and purchases. When I click on "plugins" I get a list of plugins I can install or buy. The "online map plugin" is not on this list. I see no option I can check to display more in this list.
However I think that I don't need an "online map plugin", and here is why:
Again under the menu I can select "Map" adn there under "Map Type" i can select both on line and off line maps. I also have the "overlay" and "underlay" options where again I can select an overlay or an underlay. However I do not have the option there to "install more".
So, this appears as if the iOS version of OsmAnd is a very different applicaitons, only sharing a name...