Can you switch from the subscription version of observium to the community version
by following the Upgrade to latest Major release procedure?

Community EditionĀ¶
Upgrade to latest Major releaseĀ¶
Disable observium cronjobs optional

Run the following commands (as root):

cd /opt
mv observium observium_old
wget -Oobservium-community-latest.tar.gz http://www.observium.org/observium-community-latest.tar.gz
tar zxvf observium-community-latest.tar.gz
mv /opt/observium_old/rrd observium/
mv /opt/observium_old/logs observium/
mv /opt/observium_old/config.php observium/
Update DB schema:

/opt/observium/discovery.php -u
If it has been a very long time since you've updated (12 months or more), you may want to force an immediate rediscovery of all devices to make sure things are up to date :

/opt/observium/discovery.php -h all
Re-enable observium cronjobs optional

You may now delete your observium_old directory if everything has updated correctly:

rm -rf observium_old