When trying to install the ownNote App (using the download option (https://apps.owncloud.com/content/download.php?content=168512&id=1&tan=1118461) and the copy & paste the ownNote folder into the Apps folder) the main ownCloud login screen indicates: "ownCloud will be updated to version 8.0.3". My current version is (already) "8.0.3 stable" which should be good enough according to the ownNote requirements.
While I did not request this update and the suggested update equals the current version, I clicked on the "Start" button. This puts ownCloud in maintenance mode (as set in the config.php) but does nothing further.
So I manually unset the maintenance mode and removed the ownNote folder and all is back to a working state. But obviously ownNote is not installed.
Any suggestions on how to install ownNote?