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3 hours ago, Prestashop Addict said:

Try to set PS debug mode before runnning upgrade and look at xhr response en browser console to see the error detail

Hi, thanks for your tip!

I  enabled the Debug Mode and opened the Developer Tools window of Chrome Browser .  When I click the Upgrade button, the following error is occured.

I thought the POST method to send a "ajax-upgradetab.php" file to .../admin***/autoupgrade/ forlder, when the Upgrade option of the 1-Click-Upgrade is clicked. This sending was failed and the handshaking ckeck is showing that "net::ERR_EMPTY_RESPONSE" error.  Am i at least partially right? 

1. Meanwhile I change edited the php.ini file and changed  "UPLOAD_MAX_FILESIZE" to 200M (it was 10M) and "max_file_uploads" to 200 , "Max_execution_time" to 3000 . 

2. I checked the permission of the .../autoupgrade/ directory and gave 777 ,  with "chmod -R 777  <that directory>" permission that it is definitely writable.   

Unfortunately, the upgrade was not successful and still showing the same error on the Browser Console. 

Any hint would be highly appreciated!