Hi! I have successfully installed osclass from your site, I received a confirmation email:

Osclass successfully installed!

Hi Osclass Тестовый сайт,

Your Osclass installation at http://travel-dating.com/osclasspoint/ is up and running. You can access the administration panel with these details:
username:
password:


but the site does not open:

http://travel-dating.com/osclasspoint/

 What could be the problem and can it be fixed?

@alex7070
Enable error reporting in your php and take a look into error log.

I cannot find this information in the Error.log.

But another kind of osclass (from osclasscommunity.com) works fine:

http://travel-dating.com/osclasscommunity/

@alex7070
Error 500 will definitely throw error into logs, as it is internal server error.
Communicate with your hosting provider or reinstall osclass.

[01-Mar-2021 12:15:01 UTC] PHP Warning:  require_once(/home/shalomfr/public_html/travel-dating.com/osclasspoint/oc-includes/osclass/model/Alerts.php): failed to open stream: No such file or directory in /home/shalomfr/public_html/travel-dating.com/osclasspoint/oc-load.php on line 129
[01-Mar-2021 12:15:01 UTC] PHP Fatal error:  require_once(): Failed opening required '/home/shalomfr/public_html/travel-dating.com/osclasspoint/oc-includes/osclass/model/Alerts.php' (include_path='.:/opt/cpanel/ea-php72/root/usr/share/pear') in /home/shalomfr/public_html/travel-dating.com/osclasspoint/oc-load.php on line 129

@alex7070
Error is clear, you do not have all osclass core files, like oc-load.php

Perhaps you think I'm new to websites? I have been doing websites since 2003. All files are there, it is visible in the screenshot. All files from the archive from your site: osclass-v4.3.2.zip

@alex7070
If you do it from 2003, you should be able to read all PHP errors. Problem is actually with missing file in model.
/home/shalomfr/public_html/travel-dating.com/osclasspoint/oc-includes/osclass/model/Alerts.php

Thanks! You are right, this file got lost while uploading.