How to update a Live process from portal?

1- Delete the existing and installing the new one?
In this scenario, already running cases data is also removed.

2- Should I use versioning? and disable the process from the portal and not to delete the old one?

I already have done with the first approach and now my cases are in between the process... what can I do?

Urgent, please!!

Update version of production engine, from 7.3.3 to 7.5.4

I have in my production engine version 7.3.3 of BonitaSoft installed, I would like to know the best way to upgrade to version 7.5.4? Any hint of material to get an idea of where to start would be welcome

Deploying bar file created in 7.1, onto bonita portal version 6.5


I am trying to deploy the bar file that has been created in version 7.1, on to the bonita portal that is on version 6.5. This is throwing me an error org.bonitasoft.engine.bpm.bar.InvalidBusinessArchiveFormatException: There is no bonitasoft process namespace declaration

Is this because backward compatibility won't work with Bonita? Thank you