fwiw,
It'd be useful to hear from @maxmind what they're recommending ...
I received the following response from MaxMind support:
"
Thank you for contacting MaxMind support. Though I wouldn't be able to advise
regarding the RelayCountry plugin, it's correct that our GeoIP2 Perl API has
been deprecated. It will still receive fixes in the event of major bugs and
security vulnerabilities, but it will not receive other updates. We don't have
a particular date set for when we would completely end support.
You may possibly wish to try using MaxMind::DB::Reader directly (https://metacpan.org/pod/MaxMind::DB::Reader) as an alternative. It is similarly deprecated, but unlike GeoIP2::Database::Reader, it doesn't require updates to get access to new fields.
Otherwise, in case it may potentially be of interest, there is a third party module available here:
https://metacpan.org/pod/IP::Geolocation::MMDB
"
