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

Update using composer (Method 1)

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

composer remove magefan/module-product-tabs
composer require magefan/module-product-tabs ^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 Product Tabs module was installed via FTP (check if app/code/Magefan/ProductTabs folder exists), then follow these commands:

1. Download the latest version of the Product Tabs extension archive from magefan.com.

2. Extract archive.

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

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

Install Magento 2 Extension Using FTP

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