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

Update using composer (Method 1)

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

composer remove magefan/module-xml-sitemap
composer require magefan/module-xml-sitemap ^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 XML Sitemap module was installed via FTP (check if app/code/Magefan/XmlSitemap folder exists), then follow these commands:

1. Download the latest version of the XML Sitemap extension archive from magefan.com.

2. Extract archive.

3. Make the backup copy of the app/code/Magefan/XmlSitemap 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