Each account in crm has the default fields address1_latitude and address1_longitude. These fields can be filled manually or via a tool, connecting a service provider like google maps or Bing maps. With the field service module, you already have Bing maps included. To enable the automatic filling, navigate to Field service > Administration > Field Service …
Since march 2019, Microsoft provides updates for on-premise installations every month. You can find the download links and also the change log here
Plugins are a common way to add functionality, especially in an on premise system, as there is missing the possibility for using the flows. I created such a plugin, which uses some of the localization methods, deployed the plugin to my development system and got the following error.
Microsoft.Crm.Sdk.Messages.RetrieveLocLabelsResponse cannot be cast to [B]Microsoft.Crm.Sdk.Messages.RetrieveLocLabelsResponse.