To install DF Plugins for Milestone on a remote machine without installing the DF core,
you may install it separately with a special installer – Milestone Plugins.exe

If the Milestone is on another host machine uncheck box Update Mobile Server Cors Ploicy and choose folder for MIP plugin unpacking (this folder must exist!).
Copy folder DataHubBrowser located in path you specified in this step. (e.g. E:\TmpFolderForPlugin – on screenshot)
to MIP folder on remote machine (e.g. C:\Program Files\Milestone\MIPPlugins).

On remote machine add an additional field to the VideoOS.MobileServer.Service.exe.config file.

You can find this configuration file by the default path C:\Program Files\Milestone\XProtect Mobile Server.  

Find section <HttpHeaders> and put next line into the end of this section:
<add key="Access-Control-Allow-Origin" value="*" />
<add key ="Access-Control-Allow-Headers" value =
"AccessControl-Allow-Origin, Content-Type, Authorization" />

Save all changes (Ctrl+S), close the file and restart Milestone Mobile Server