I think your EPG loading profile is missing a piece of info.
Go to Tools > Options > Television and select "DVB-S" in the list box under Tuner Profiles. Then click Configure button.
Go through the wizard and make sure you type in a name in the box for "Provider Token". It is probably pre-filled with "DVB-S", which is fine, but you can probably type in something more specific, for example something that tells yourself which satellite this EPG is being setup for.
You can then do some cleaning up - go to C:\Users\[user]\AppData\Roaming\J River\Media Center 21\Settings\mc2xml\ folder, and delete files with extension .dat
When finished, run "Load Program Guide..." tool again. On the same window as your first screenshot, you should see the Details of your EPG loading mode "MC2XML" looking like this: "country: GB, postal code: JE2 6QQ, data source: standard, provider token: TheTokenYouEntered".