If you need to update Magento 2 Auto Currency Switcher Extension by Magefan, please follow the steps below. Note that the update instructions depend on the method auto currency switcher extension was installed with.

Update using composer (Method 1)

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

composer remove magefan/module-auto-currency-switcher
composer require magefan/module-auto-currency-switcher ^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 auto currency switcher module was installed via FTP (check if app/code/Magefan/AutoCurrencySwitcher folder exists), then follow these commands:

1. Download the latest version of auto currency switcher extension archive from magefan.com.

2. Extract archive.

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

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

Magento 2 Extension Installation

5. 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