Hello.
You can upgrade from the admin section by clicking on the message about an upgrade or using the abantecart_upgrade_134 installation key in the extension installation section.

Hello.
Please confirm that you are running the most recent version of AbanteCart, which is 1.3.4. Also, ensure that the URL you are accessing matches the store URL specified in your Store settings.https://abantecart.atlassian.net/wiki/spaces/AD/pages/5832828/Store+URLs+SSL

Hello.
The latest version is 1.3.4. The Mail mean all email send by your hosting provider (PHP mail send feature) and if it is not work you should ask your hosting support why it is blocked.

Still not receiving notifications when making a sale. Does 1.3.3 fix that?

Could you please check if there are any errors in the AbanteCart or server error logs? Also, have you made any modifications to or disabled any email templates in the Design > Email Templates section?

Please ensure that you eliminate any restrictions on weight and volume in the shipping extension settings. Additionally, verify that the address details in the FedEx extension are accurate; for instance, the country should be listed as 'US' instead of 'USA', and the state abbreviation should consist of two letters.

Note that the payment method selection is contingent upon the delivery method being chosen first. Therefore, Stripe will not be an option until a delivery method is set. For testing purposes, activate some basic delivery methods.
https://abantecart.atlassian.net/wiki/spaces/AD/pages/3702820/No+payment+at+checkout

Hello.
Try to insert video as HTML Resouce like https://www.w3schools.com/html/html5_video.asp

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