Hello.
When a blank page occurs, you should still be able to see the errors in your AbanteCart error log file. You can view this log file (/system/logs/error.txt) or server error log via your hosting panel's file manager, which will help you identify the issue. The most common causes are outdated extensions, custom code or an incompatible PHP version.

Additionally, please note that your 1.2.16 database will not work with the 1.4.0 code.

Hello.
The font controlled by your theme CSS. To override theme rules and change the font family in CSS, you can use the following CSS code.
<!-- Or in your CSS -->
@import url('https://fonts.googleapis.com/css2?family=Roboto&display=swap');

/* Then use the font in your CSS */
body {
    font-family: 'Roboto', sans-serif !important;
}

Hello Devs, what should I do for a successful upgrade, because I tried upgrading my test site and i did not go 100%

Hello.
Please review the errors in the log and let us know why you believe it is not functioning at 100%.

It is probably rounding.
What is the price set in the admin and what is the default tax rate applied?

Hello.
The Novator theme is primarily managed through the regular AbanteCart theme settings, which include layouts and blocks. While there isn't a specific guide for Novator, you can follow the general AbanteCart documentation for modifying the home page, banners, and other elements.

Hello.
If you have enabled reCAPTCHA in the settings, you can try disabling it manually through the database.

This topic has been moved to Tips and Tricks.

https://forum.abantecart.com/index.php?topic=10934.0

Hello.
Please check your AbanteCart error log for last errors