If you are trying to upgrade Unomaly and receive the following error:
ERROR: Unable to continue with the installation
A previous installation failed.
Please contact support!
This means that a previous upgrade finished unsuccessfully. If you don't know why this happened, please contact support so it can be investigated. If you have already fixed the issue, you can run the following command to remove the lock file:
sudo rm /DATA/unomaly_UPGRADING
Afterwards the installation should continue as normal.