@MPenzi Does this refer to the beta or is this a general question? Of course, when upgrading a Nextcloud, e.g. from Nextcloud 27 to Nextcloud 28, you cannot simply unzip the files. The unpacking, which is part of updater.phar, can perhaps still be done manually. However, you will of course also need to make changes to databases, for example. And therefore is the script updater.phar. Alternatively, you can also use the web based updater from Nextcloud.
In the first post of this thread the command to execute updater.phar is missing. Here the command but i think all beta tester know the command to “upgrade as usual”:
sudo -u www-data php /var/www/nextcloud/updater/updater.phar
(change webserver/nextcloud-username and/or nextcloud path, execute from root)