Upgrade 2.5 - 3.3.6

I have updated Joomla to the latest version and I am trying to update my World News template as well.
I have tried the files here: https://www.gavick.com/download/joomla- ... worldnews2

But they fail.
Are these the correct files? How can I install them?

You should use this file:
gk_twn2_J!3.zip

Okay, I just tried again, but still getting this error:

JInstaller: :Install: Failed to copy file /var/www/html/tmp/install_54b3ee68e9e29/gk_twn2/index.php to /var/www/html/templates/gk_twn2/index.php

Does anyone know the reason for this?
Or a different way to install?

Anyone?

Please do not bump your thread as it makes you wait longer.

Please contact your hosting company support as it looks like some permission issues on your server.

How does bumping make me wait longer?

Because if you answer your own question it goes to bottom of our threads queue.
And we simply reply to threads that waits longest first.

Okay, I got the template to update, but my front-end is giving me a notice: "Notice: Use of undefined constant DS - assumed 'DS' in /var/www/html/templates/gk_twn2/html/com_content/featured/default.php on line 14" and an error: 500: jhtml icon not found.

Please disable error reporting in Joomla configuration.

Error reporting disabled, the notice is no longer visible but the 500 error is still there. I can't see anything on my site at all except the error.

Please check this site:
https://www.ostraining.com/blog/joomla/ ... -problems/

Okay, I went through and made any changes that need to be made, but no change for my site.

You need to run clean Joomla installation (I suggest to use quickstart) in a subfolder or something and in the 3rd step check recommended settings. If any of them is not green, then you need to contact your hosting support and ask how to change those settings.

I am not really sure what that means?
This is a clean installation, I did it twice already. The recommended settings are all off just like in the link you sent me.

I tried installing the quickstart folder and it doesn't tell me whether it was installed successfully or not, just goes back to the regular install page.

Please check this forum thread:
https://www.gavick.com/forums/rockwall- ... 34#p128334
99% of this type of problems comes because of hosting server incompatibility. You need to check every Pre-installation check element and recommended settings. They need to exactly fit. Colour needs to be exact AND On/Off state needs to be the same.

What does this notice mean?

Notice: Use of undefined constant DS - assumed 'DS' in /var/www/html/templates/gk_twn2/html/com_content/featured/default.php on line 14

I realized that I didn't disable the template before migrating, so I started from the beginning, disabling the template this time. I migrated and installed the Joomla 3 template but still getting the same notice and 500 error.

You told me before to turn off the error reporting, which gets rid of the notice but that doesn't mean it is not still affecting my site.

I opened the php.ini file to edit, but no changes were needed.

Where is the installation/index.php file located?

Nevermind.

Notice: Use of undefined constant DS - assumed 'DS' in /var/www/html/templates/gk_twn2/html/com_content/featured/default.php on line 14

The override is using "DS" which should have been replaced by "/".
I changed: JHtml::addIncludePath(JPATH_COMPONENT.DS.'helpers');
to: JHtml::addIncludePath(JPATH_COMPONENT.'/helpers');

I can actually see my site now, even though it is a little messed up looking from all the extensions I disabled.
I should be on track now to get it going again.

Seems this is related to php version somehow and Joomla itself.
It could be also solved this way:
https://www.gavick.com/forums/general-d ... t-ds-41727