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

Update using composer (Method 1)

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

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

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

2. Extract archive.

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