Solved Installation fails at ~2% "Kunena Installation failed"

I am trying to install Kunena 5.19 and 5.20 for the first time on a Joomla 3.9.22, PHP 7.3.10.

Installation stops after ~2% without a specific error message. It just says "Kunena Installation failed."
It generates an Kunena entry in "Components" but every time I click on any of the menu entries the installation tries to start again and fails.
3 tables are generated in the database. kunena system plugin is shown as active.

I am running DJ Classifieds on the same Joomla Installation and need a forum in addition. All other plugins, modules, extensiosn are working flawless.

What I did:

- Checked and confirmed PHP-settings and server requirements.
- I deactivated all non-Joomla plugins
- I tried installation via web, URL, Package-upload, unzipped it and tried via tmp, installed package also separately (I dropped the generated kunena-tables and uninstalled all kunana-plugins every time and cleared the cache before trying antoher method)

The fact that only 3 tables are generated looks to me like a mysql-problem?

Can anyone help me? Happy to provide a donation. I would love to work with Kunena.

Hello,

maybe the max_execution_ time or upload setting is too small
you could have a look at that at php.ini settings

minimal

but is already quite old so increasing the values to eg like this would be better
sample php.ini settings

Thanks, checked all setting again and I even exceed some already.

BTW: Why does Kunena require allow_url_fopen: true?

I don't know exactly why it should be on
but if a little googled then I come across in read more joomla itself that it is necessary
and if Kunena herself also says in explanation that he must, I assume that it is important.

The fact that only 3 tables are generated looks to me like a mysql-problem?

I'm not sure if it helps, but try the following:
First remove these 3 tables.
Then start the installation and when the installation stands, go to \administrator\components\com_kunena and remove the install.php
Then refresh in the backend the page.

If I do that the installation procedure stops (as the page is refreshed) and I of course get the error msg:

"42S02 SQLSTATE[42S02]: Base table or view not found: 1146 Table 'XXXXXXXXXXX_2.u4l80_kunena_configuration' doesn't exist ".

Because no table exists and the installation procedure has been stopped.

I cannot refresh without cancelling the installation process?