Update of UserCountry - Data goes wrong

Dear All,
I’m using Piwik 3.2.0 on an ubuntu 16.04.3 LTS server with PHP 5.6.31.

The Plugins UserCountry and UserCountryMap are installed.

In System > Geolocation > Setup automatic updates of GeoIP databases
It’s set up like here:
Geolocation Administration Piwik|645x500

I’ll regularly get this error message by mail:
ERROR [2017-11-16 10:31:07] /var/www/vhosts/XXXXXXXXXXX.XXXX/httpdocs/piwik/plugins/UserCountry/GeoIPAutoUpdater.php(147): GeoIPAutoUpdater: failed to download ‘http://geolite.maxmind.com/download/geoip/database/GeoLiteCity.dat.gz’ to ‘/var/www/vhosts/XXXXXXXXXXX.XXXX/httpdocs/piwik/misc/GeoIPCity.dat.dat.gz’: Error while creating the file: /var/www/vhosts/XXXXXXXXXXX.XXXX/httpdocs/piwik/misc/GeoIPCity.dat.dat.gz

I then tryed to run the update script over ssh directly on the server:
php /var/www/vhosts/XXXXXXXXXXX.XXXX/httpdocs/piwik/plugins/UserCountry/GeoIPAutoUpdater.php

but then it shows me this error message:
PHP Notice: Use of undefined constant PIWIK_INCLUDE_PATH - assumed ‘PIWIK_INCLUDE_PATH’ in /var/www/vhosts/XXXXXXXXXXX.XXXX/httpdocs/piwik/plugins/UserCountry/GeoIPAutoUpdater.php on line 11
PHP Warning: require_once(PIWIK_INCLUDE_PATH/core/ScheduledTask.php): failed to open stream: No such file or directory in /var/www/vhosts/XXXXXXXXXXX.XXXX/httpdocs/piwik/plugins/UserCountry/GeoIPAutoUpdater.php on line 11
PHP Fatal error: require_once(): Failed opening required ‘PIWIK_INCLUDE_PATH/core/ScheduledTask.php’ (include_path=’.:/usr/share/php’) in /var/www/vhosts/XXXXXXXXXXX.XXXX/httpdocs/piwik/plugins/UserCountry/GeoIPAutoUpdater.php on line 11

Does anybody have had this problem already?

Thank you in advanced!