Hello, I still haven't solved it.
I contacted hosting support and they told me the following:

Please note that for security reasons, the following features are disabled by default in the cPanel control panel for all shared hosting accounts:
'disable_functions = show_source, system, shell_exec, passthru, exec, popen, proc_open'

So in this case what could I do. I still have the same problem that when they create the account the page remains blank.
I require your great help team. and thank you for what you have told me.
If anyone knows what I can do to fix this problem. I appreciate

Hello. switch to the native PHP Mail feature (Mail Protocol: Inner Mailer) https://abantecart.atlassian.net/wiki/spaces/AD/pages/7372837/Mail+Settings

Hello.
Make sure your php version is 7.3 but the preferred solution will update your AbanteCart
https://abantecart.atlassian.net/wiki/spaces/AD/pages/3768390/AbanteCart+System+Requirements

I tried that. It got me a message that says

8.0.0+ Required for AbanteCart to work properly! Please contact your system administrator or host service provider.

I had the host set php to 8.0.0.

Now it is no longer possible to add items to the cart at all, AND the add buttions are still disabled!

Hello. If you see this message the PHP version switch not completed or did not have any effect on your site. You should switch the version with help of you hosting support, login to upgraded AbanteCart and clear the AbanteCart cache

Hello.
Please contact the 3rd party extension author https://marketplace.abantecart.com/order-support

Hello.
Go to your hosting file manager and locate the /extensions/ folder and remove the ups folder for the extension you have purchased.
To resolve the issue ask for help from the author of the extension at the marketplace.

Hello.

Please follow this topic to resolve connection issue https://forum.abantecart.com/index.php/topic,10653.msg40963.html#msg40963

the problem with media is if i resize to 400x400 and upload it works so i don't know but maybe the resizing isnt working, another is i keep getting System warning has been reported. Check system messages  which is the index.php and the config.php permissions are set wrong but they are set to 755 which i thought was correct?
please can anybody help

Hello. The resize uses the hosting/server RAM (memory). If memory is low or hosting ignores the memory limit you set in the php.ini file the resize for larger images may file on the server side.
To check your real memory size, please check PHP info in your system settings https://abantecart.atlassian.net/wiki/spaces/AD/pages/7667770/PHP+Info

Also, you have the 1.3.3 version please upgrade to the 1.3.4