Upload the correct extension version and install it via admin panel > Extension > Install Extension > Extension Upload.
For most of the extensions just directly install the extension upgrade without loss of the settings. You do not need to uninstall or delete your existing extension version.
The exceptions to the general rule for specific extensions are listed below:
For upgrading versions of:
1. Telephone Option v126.96.36.199.
2. VAT/Tax Option v188.8.131.52.
3. Advanced Reports v184.108.40.206.
The core/lib/package_manager.php file in some AbanteCart versions must be replaced.Please check the details and find the download here . This should be done PRIOR to install/update of this extension.
For upgrading AbanteCart Core and all versions of Telephone Option Prior to v220.127.116.11, Advanced Reports v18.104.22.168, VAT/Tax ID Option v22.214.171.124:
1. Uninstall the existing extensions.
2. Delete it.
3. Install new version, then setup the settings.