kbento with kunena 5.1.8

Good morning, we purchased a copy of nts_kbento, but after installing and selecting this template the pages with the kunena forum return this error "500 Internal server error, fatal error detected!".
This joomla is inside an intranet isolated from the internet and cannot be updated, this is the configuration:

•       Apache/2.4.6,
•       PHP 5.6.40,
•       MySql 5.6.42,
•       Joomla 3.9.2
•       kunena 5.1.8.

Maybe the problem is related to the fact that the template is too recent? Even if you indicate it is compatible with all 5 versions of kunena.

Maybe your model version:
Could updating "July 2, 2020 Version 5.2.6 to Kunena Compatibility to the latest version 5.1.18" solve my problem? Is it possible to have this version?

Everything on your site is outdated. If you don't want to, or can't upgrade to Joomla 4 and Kunena 6 at least update to Joomla 3.10.12 and Kunena 5.4.12

As I explained, I cannot, that is, it is too expensive, to update the php version, there are many customizations on this intranet, integrations with ldap, alfresco, use of some frameworks such as cakephp... I would have preferred to have a non-updated version of the template that worked with my setup. Otherwise the solution for me is to change the kunena default template.

Hi Cigliano,
If you are using the Kunena 5.x. You should choose the nts_kbento_k5.zip file when install the template for Kunena.

Kind regards,

Hi administrator
That's what I did!

Kind regards

I still have a zip file from Kunena 5.1.19 on my computer. Happy to share it with you. Maybe that helps. That should still work with your PHP version. Not sure off course if kbento will work then.

Hi Cigliano,

Please try to update the Kunena 5.x component to latest version K5.2.13. Don't forget backup your website before upgrade the Kunena component.

Kind regards,

@Hung: as Cigliano stated before it is not possible to update to K5.2.13, because it is not possible to update PHP version. And K5.2 requires PHP 7!
He just asks for an older version of Kbento!

Hi Pinkeltje,
you were very kind to want to share this old version with me, luckily kenena has a repository for all versions. Thanks anyway. I share with you this link which has always been very useful to me.
github.com/Kunena/Kunena-Forum/releases?page=7

Hi Pinkeltje,
Thanks, you explained my need better than me.