Rhobur

Glad to hear, please edit your first post and add [SOLVED] before the title.

You're welcome! Did it solve your problem? If so, we can mark this as SOLVED to help other people with the same issue.

In Design->IQITthemeeditorbackoffice la Content->Product page poti schimba locul afisarii tab-urilor.

to me it worked both the layer cart and adding to cart, https://i.imgur.com/m9IMH8r.png Other than that I see lots of image not found errors and considering you have problems with debug off there is most likely you have some server issues, check your server logs.

you may have some resources not being loaded through SSL, check the browser's inspect tools->console for such errors.

you seem to be missing the column filter_id from the cecf_admin_filter table for some reason; here you have attached the PS1.7.6.1 version of this table, you can import it instead of your current one. ps_admin_filter.sql

You need access to server to install the php7.X-intl extension (where X stands for your php7 minor version). Either that or contact your hosting to install it for you.

I suppose you tested with several browsers and you don't have Cloudflare or similar to cache things. So, no JS errors in console and no frontend errors with debug activated?

It clearly has a problem with JSON data sent by a module probably. Disable the JS caching in backoffice so there may be a more explanatory JS file name. Anyway, you'll have to dig into that JS file at that specific line and debug to find out which module has this issue.

Delete the vendor directory completely and upload the vendor from the 1.7.6.1 archive.

Check the console tab of the browser's inspect tools and see what javascript errors are there.

Check if the getCanonical method from the classes/controller/FrontController.php is declared as public function

you should replace your encrypted password from the employee table (using phpmyadmin) with another one, md5 encoded, made of your password+cookie_key string form app/config/parameters.php.

You mean there is no email list in the Advanced Parameters/Email backoffice section?

Check if those 2 modules came with an override dir then rename all those files from the PS override dir, if they exist there too and are not used by other modules

Since the module is broken you should ask for support from its developers. Meanwhile if you don't have BO access to uninstall it, go by FTP/SSH to the modules directory and rename that module e.g from module_name to module_name.bad. Once done you'll get the site working again. If not check if the module comes with an override dir then rename all those files from the PS override dir, if they exist there too and are not used by other modules.

I wonder what Invision has to do with it?

most likely these files do not exist there, try removing the vendor dir completely then importing it back from the PS archive (checking the permissions afterwards).

What if you remove this table from new server and import it back from the old one (changing again the domain name/directory)?

Shouldn't be that painful 😞 If you keep your PS files on an user directory, depending on the server's settings, you might want to add that user to the Apache's group (or nginx accordingly) then set up the perms as 0775 for dirs and 0664 for files.

desigur, vezi aici https://zemez.io/prestashop/support/how-to/prestashop-1-6-manage-product-relations-crosssellers-accessories-products-category-2/ cum sa iti setezi produsele pentru acest modul.

Yes, you can skip any column not marked with the "*" although if you skip the category for example. all your products will be assigned to the default Home category. As for a free module to populate your csv I am sorry, not aware of something like that.

Nu stiu sa existe o setare BO pentru asta dar poti modifica tipul de camp pentru coloana name in ps_customization_field_lang din varchar in text. Poti face asta usor cu phpmyadmin.

You have to use the sample Products.csv and fill your products data in there. Mind that not all those columns are required so you can remove the columns you don't need from this sample file. The required columns have a star, "*", next to the column title.

I think, there are to many tables and relations between them to consider a manual upgrade so I'd advise you use a paid module for this. I see that some of my clients are successfully using, https://addons.prestashop.com/en/data-migration-backup/8934-migrationpro-prestashop-upgrade-and-migrate-tool.html