Update v2 to v3 - addon - matrix & nsm_better_meta
How Do I?
Just a warning
If you consider to update EE2 with the addons nsm_better_meta and matrix.
It can become a pain in the ass if you update your system to EE3.
DISABLE and REMOVE those addons completely in v2 before you think about an upgrade to EE3.
That stands to reason since neither of those add-ons have versions for EE3. I don’t think nsm_better_meta will ever be updated, but a Matrix update for EE3 may still be in the cards now that eeHarbour acquired it.
Or you can use EL’s tool to convert Matrix data to the native Grid format before updating. https://github.com/EllisLab/PlayaMatrixImporter
I thought they automatically get de-installed in the automatic update process, which did not happen.
I exported the EE2 database, copied the new files upgraded and had a problem.
They disappeared in the back end-panel but kept to be hidden installed in certain positions and it’s a pain to fiddle out where and manually remove them now. That’s the whole point.
I have problems to find all database entries which I have to manually remove now as I get error messages in the admin panel.
So it’s a matter of sequence how you do it, I just forgotten that essential step in the upgrade process.
Yep, before any upgrade, large or small, you need to confirm 3rd party add-ons are compatible and/or have an update, and those are done first before upgrading EE itself.
https://docs.expressionengine.com/latest/installation/upgrade_from_2.x.html
Best of luck!