Adding languages, list empty

I have two test websites running latest version of Joomla. In one environment I have upgraded Forms to 1.6 by downloading the ZIP file from the website. Under Extensions I used Install to install this new version. I do not use Joomla caching, logged out and logged in, deleted browser history. But unfortunately I can not see the list of languages. When I click on the Language button, I see an empty list.

However, on my second test website I used the built-in method to upgrade Forms. After the upgrade I logged out and logged back in. When I go to the Language screen I can see a full list of languages. Same browser, same computer.

I re-installed Forms on the first test website, but no success.

Hello,

Websites placed on different hostings?
If yes, I think, the problem comes from hosting security, you can send us FTP and Joomla admin access and we can check what's going there

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Regards,

I have found the culprit. I have two websites for testing. One site is almost empty for testing Components and for other development. On this website Form was running fine with the languages. I have another website for testing which is in fact a copy of the production website. I compared both websites to find the cause of this problem. On the production website I am using httpS, but not on this copy of this website in my home situation. I already removed the extra lines from the .htaccess file, but forgot to disable httpS from the backend in Joomla.

So you need just to disable SSL (httpS), import language and then enable SSL back