Hi Micha.

You have two options:

1. Enable plugin "Behaviour - Backward Compatibility 6" and it may work after.
2. OR, indeed wait for offcial Template update that should be soon.

If that new site is still "empty" becuase you just started building it, you have also 3rd option. Install Joomla 5.x over it, install & add what you need, then after X weeks just update template, and then upgrade Joomla 5>6 in seconds. All should be smooth after, and client won't see any difference, site is site.

Tried 1. and now it says,

"Warning: Database not set in Joomla\CMS\Installer\Installer"

(2) or (3) left. My magic powers are limited

Does "Install Joomla 5.x over it" erase our users and will it use the already existing database well ?

In Joomla you cannot downgrade CMS version. It means totally new installation. If You are advanced user, you can export some tables from current DB and import them in Joomla 5, for example, Users, Content or SPPB. It should work.

Use PHPMyAdmin tool from cPanel.

I think we better just create a seperate db and do a full new install of everything ... bc if any later, some error occurs, we will never know if the reason could be some incompatibility.

From what i get from the initial install error msg, there are completely new classes in Jommla 6 and i wonder if an upgrade of an up-and-running template is that easy. Will they really be able to ever do it ? What if not, will we get a 'activation-and-counter reset' if we need to change to a new template if we want to upgrade Joomla ? I mean, those delays were caused bc we've waited for the 'Salon' update, which did not come up until now, and now even have to do a reinstall. (Package 'Personal'.)

Joomla 5, as I remember, will be supportted till Sep/Oct 2026. It means that you have 7 months for upgrade.

Yes, using a new DB can be a good option. Or use at least a new db prefix.

If Joomla developes added that feature, it means that is possible without using extra hacks/extensions.

ok now i downloaded the template Salon Quickstart package "Quickstart Pack Joomla 5" (Version 2.0.1) and extracted it on the server in a htdocs/joomla (a folder which i have created before).

• Set the server config to that path, works OK
• set the PHP version to 8.3.3.0 (they do not offer any other 8.3 and alternatively only 8.4 and 8.5) which is according to Joomla 5 recommendations.

Opening juist the domain URL (without any sub-path) worked fine. The Joomla Installer started as expected.

But after configuring Superuser and Database, the installer fails with an apparently template-related error:

Warning: simplexml_load_file(): I/O warning : failed to load external entity "/var/www/k5453-1/htdocs/joomla/plugins/system/TmplHelixUltimate/TmplHelixUltimate.xml" in /var/www/k5453-1/htdocs/joomla/libraries/src/Installer/Installer.php on line 2080

It appears thet the file TmplHelixUltimate.xml does not exist in that location, in the Quickstart package. (I checked both the server install and the downloaded package in my computer).

There is a file 'installer.xml' instead.

try to take that file from Helix Ultimate quickstart.

if will not help, indeed, rename.

It worked, thanks !

By the way, since we are new to Joomla ... do you happen to have a recommendation for a Backup App other then Akeeba ?

Ha that's a funny rule ... then how about 3=done :D

Anyway thanks for your informative answer ! -Micha

It's a survival & first-aid rule, but also used in IT sometimes, and not funny at all. I told you that as instructor.