How to go back to previous version of joomla?

Question

Joomla

Hello, I now have version joomla 3.9.0, when I go to the Material Manager section, I get an error 500 Unknown column 'a.note' in 'field list'
I think this is due to some jambs in version 3.9.0, therefore, in order to get rid of the error described above, I want to return to the previous version, for example, to 3.8.12.
Please tell me how to do this, return to the previous version?

Answer 1

No, this is not a bug of the new version, it's a bug of an upgrade, for some reason the new field was not registered in the database
Try first to fix the database /administrator/index.php?option=com_installer&view=database - fix There is
no way to return by regular means, only if there is a dump of the corresponding version