Is there any way to convert the owncloud version 10.3.x to nextcloud or to downgrade owncloud version?
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Hello,
Yes, you could just use the NextCloud migration tool.
Log into the ownCloud server via SSH
Go to the folder where ownCloud is installed. That is typically something like
/var/www/html/owncloud
Use the following command to download the migration script:
*. Now go to the URL of your ownCloud server in a browser and log in. Then append to the URL this: updater/index.php so it looks like:
https://your.owncloudserver.com/updater/index.php
*. Then you can just follow the steps
For more information check out the official NextCloud documentation here:
https://nextcloud.com/migration/
Hope that this helps! Regards, Bobby