The latest version of the Bitrix24 Desktop app for Windows XP was released in 2016.
From October 3rd, 2018 Bitrix24 Desktop app for Windows XP stops working. That means XP users are not able to use Bitrix24 Desktop app anymore.
But you can still use your Bitrix24 web version and web messenger (for example, with the latest version of the Google Chrome browser for Windows XP 49.0.2623.112).
You can always download Bitrix24 Desktop app for other operating systems from our official website.