Can't seem to upgrade to 1.5.2.0 to 1.6.x

[Wobybi]

We've been trying to update our PrestaShop site for about two days straight now, here's what we've tried:

1. Installing the 1-Click Upgrade - Autoupgrade add-on (in our module list, version 1.6.7, a hand pointer with a circular green arrow icon). Clicking on Install yields a "Module not found" error.
2. SSH'ing into the server reveals that, in the modules folder, there is an autoupgrade folder, that only contains translations/de.php (no other files or directories whatsoever).
3. Downloaded the autoupgrade module from the PrestaShop Addons Store and tried to use the Add New Module button to get it on the server. Claims the archive is corrupted.
4. Unzipped the module and zipped the contents of the autoupgrade folder instead of the folder itself, then tried the Add New Module button again. Says that module was downloaded successfully, but clicking on Install yields the same "Module not found" error. Searching for "upgrade" only shows the version that was already there, with the green icon.
5. Unzipped the module again and just FTP'd it over to the server's module/autoupgrade folder. Noticed that the icon changed to the grey and pink one, and that the title has lost the "- Autoupgrade" part, though. Clicked on install, and receive another error: "Can't write in [PS root dir]/backoffice/autoupgrade directory"
6. Check the permissions to see that the whole thing is set to 755. Change backoffice/autoupgrade to 777 and try again. Receive message stating that the module has installed correctly.
7. Go to Advanced Settings > 1-Click Upgrade, and receive a blank page accompanied by a 500 error.

After all of this, we restored the server that we were trying to update to the snapshot we took before the whole process, so the state of things is as it was just before we tried all of this. We have a test server and clean snapshots to return to, so we can experiment to see what will work before applying it on the production server.

 

Any insight or directions for us to go in will be appreciated. Thank you.

[El Patron]

Hi, in regards too 500 error the underlying php error must be obtained.  This gives clue as to why it fails.

https://www.prestashop.com/forums/topic/224525-how-to-turn-on-error-reporting-for-debug-information-blank-page-500-internal-server-error/

[Wobybi]

This is the PHP error I receive:

Fatal error: Call to undefined method AdminSelfUpgrade::addJQuery() in [[PS root directory]]/modules/seur/seur.php on line 1404

Edited October 14, 2016 by Wobybi (see edit history)