If you need to update Better Magento 2 Checkout by Magefan, please follow the steps below. Note that the update instructions depend on the method Better Checkout extension was installed with.

Update using composer (Method 1)

If the Better Checkout module was installed via the composer (check if vendor/magefan/module-better-checkout folder exists), then you need to run these simple CLI commands in Magento 2 directory:

composer remove magefan/module-better-checkout
composer require magefan/module-better-checkout ^x.x.x
# replace x.x.x with the version you want to use
php bin/magento setup:upgrade
php bin/magento setup:di:compile
php bin/magento setup:static-content:deploy

Update using FTP  (Method 2)

If the Better Checkout module was installed via FTP (check if app/code/Magefan/BetterCheckout folder exists), then follow these commands:

1. Download the latest version of the Better Checkout extension archive from magefan.com.

2. Extract archive.

3. Make the backup copy of the app/code/Magefan/BetterCheckout folder on your server and then remove it.

4. Using FTP, copy the app folder from the archive to your Magento 2 Directory. 

magento 2 Extension Installation

4. Run update CLI commands in Magento 2 directory:

php bin/magento setup:upgrade
php bin/magento setup:di:compile
php bin/magento setup:static-content:deploy