upgrade from V2 > V3

You just need to update your apps and perch core files. On the download page is instructions for updating.

Sorry Tom, Rene's post is correct.

Thanks, on the download page I can only see forms, where are 'content', 'assets' and 'categories'? https://addons.perchcms.com/

Those are core apps. They will be in your download of perch.

You will be updating your apps.php file to remove those apps as part of the upgrade process.

From the update docs:

You don’t need the Content or Categories apps listed like in the past. Just add an entry to the list for any add-ons you need installed. For example, an install with Blog and Twitter apps would have:

<?php
    $apps_list = [ 
        'perch_blog',
        'perch_twitter',
    ];