I see most recent patch realeased MAGENTO 2.2.3, 2.1.12 and 2.0.18 SECURITY UPDATE
I want to download for my Magento version 2.1.9. How and where do I download the patch file?
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Its better to go for version upgrade with the latest one.
You can download them from official Magento website:
Some more information:
If you have ssh access to your magento instalation, you can update magento using composer:
composer require magento/product-community-edition 2.2.3 --no-update
And then run:
composer update --optimize-autoloader bin/magento setup:upgrade bin/magento setup:di:compile bin/magento setup:stati-content:deploy
Note: Make a backup before preceed. All comands must be executed on magento root folder.