Some of you may be aware of an issue where the GOG Downloader on XP can't connect to the server so you can login and download games. I believe that components used by the downloader and supplied through Windows Update have out of date values.

The easiest fix i know of is using the unofficial Service Pack 4 by harkaz. The current version 3.1b has all Windows XP and POSReady 2009 updates up to January 2016 and the author has said a final update will be made once POSReady 2009 support ends in 2019.

Hope this helps those that have struggled.