Update to 4.3

I am glad I backed up my data,
I tried updateing from 4.2.11 to 4.3 how ever it didn't go as planned :( I backed up files into another directory , then I uploaded the update then I went on /patchme.php and I got a 500 error plz help...

Can you take a look at your error log to see what is happening? A 500 error is too general for me to help. Can I also get your software specs? PHP version? mySQL version?

Unfortunately, due to a glitch in cpanel I can't access my error logs .however a screenshot of what is happening is at http://btech.uk.tn/Screenshot_2017-10-29-15-01-46.png
info
PHP version 7
Sql version 5.6.21

It looks like your server is configured to hide php errors, so it gives a generic error message.

On whichever page you are getting the error 500, can you add these two lines just after the opening php tag....

error_reporting(E_ALL);
ini_set('display_errors', 1);

That should give you a more descript error.